A Gem of a Watch for a Diamond Year – the Jaeger 101.

Aug 12, 2012,02:48 AM

[The Queen and her watch: notice the slim bracelet on the wrist of the Monarch]

On May 13th this year Jaeger LeCoultre was chosen as the timekeeper of Queen Elizabeth II Diamond Jubillee. A short presentation and ceremony took place at Windsor Castle. The Jaeger LeCoultre 101 and Her Majesty Queen Elizabeth II of the United Kingdom of Great Britain and Northern Ireland, have shared most of the last 60 years together and in that time both have retained their position in the world with grace despite the world around them changing. The Jaeger LeCoultre 101 calibre remains (to this day) the smallest production manual wind movement in the world. Despite its vintage, and a few adjustments along the way, the 101 movement that you see today is much the same as it was when first made.

[The earliest Jaeger LeCoultre 101 in the collection, with the accompanying design drawing from the time]

[Designs for Japan: the magazine advert and the watches from the 1970’s]

[A Mondrian-esque design from the last decade]

In a world where the latest watch has gravitated towards the largest possible mechanical device to fix to the wrist, the 101 serves as a reminder of when pre-eminence in the watch world was marked by the ability to produce smaller, more accurate movements for a case of the same size and proportion. Etiquette in the 1930’s was that a lady was only to wear a watch during the daytime, not for formal or evening events. The 101 watch overcame the problem. Set in a diamond bracelet, the watch was all but hidden (apart from the small watch face) and hence a lady could tell the time at an event, without infringing on the etiquette rules of the time. It was for that reason Queen Elizabeth II for her Coronation chose to wear a 101 diamond bracelet watch for the occasion. Her Majesty could mark the passage of time during the day without anyone (except those standing very close by) being aware that a watch was being worn on the regal wrist. There was nothing else like it then; or now for that matter.

[The 101 jewelry pieces have been innovative: the watch face hidden below a moveable clasp]

There can be little doubt that along with the Reverso and Atmos clock, the 101 is Jaeger’s other iconic and historic piece. And in that, there is also recognition of Jaeger’s ability to push the miniaturization of a mechanical movement to the smallest possible set of dimensions. 1925 was an auspicious year. As well as being the year of birth for Her Majesty Queen Elizabeth II, it was also the year that Jaeger LeCoultre took a considerable step forward in reducing the size of the mechanical watch movement. Whereas previously, there was always a move by watchmakers to concentrate on a single plain to minimize the depth of the movement, Jaeger turned the problem on its head (almost literally). Jaeger introduced the Duoplan that took a small movement and made it smaller by basically dividing it in half: placing one part of the movement (the winding barrel and part of the gear train) on top of the other half (containing the other part of the gear train and the escapement).

[The Duoplan watch from 1925 with the manufactures’ literature on the watch. If the movement needed replacing, the replacement movement was supplied in the tube and simply fitted into the watch case.]

The new architecture of the movement: constructing the movement in this manner, it made the movement stronger (more robust), but the design now aided the ability to repair the movement: being able to work on one half of the movement while the other half remains complete.

[From left to right: the 104 Duoplan movement from 1925; the 403 movement from 1927; the 409 movement from 1929 and then the 101 movement in also in 1929]

From the successful development of the Duoplan, it was now possible to reduce the size of the mechanical movement. In an industrious 4 years from 1925 until 1929 Jaeger succeeded in reducing the movement size from the 104 (Duoplan) to a staggering 14 x 4.8 x 3.4mm with the 101 movement. At its debut, the Calibre 101 set the record for the world’s smallest movement and 83 years later in 2012, it still holds that honour. When you think about all the patents and record-breaking feats announced every year in the world of horology, holding this distinction for such a long time is even more remarkable.

[The 101 movement was not simply the preserve of the women’s watches. A pair of men’s cufflinks from the 1930’s]

[A ladies diamond bracelet watch from the 1930’s]

[A haute joaillerie piece from the last decade]

The current construction and development of the 101 movement since its inception in 1929 is possibly artisanal watchmaking still in its purest form. The watch parts are crafted in order that they fit the movement. The movement parts have to be individually examined and placed to make sure that they will work together. The movement construction requires such skill that only the most talented of the watchmakers at Jaeger LeCoultre can work on them. The same watchmakers that work on the high complications such as the Gyrotourbillon also work on the 101. The 101 movements are reserved these days for the most skilled of watchmakers. The ridculously small balance wheel and spring are fitted by the same specialist that fits the balance wheel and spring for the Gyrotourbillon 2. Both escapements use gold balance wheels both require extraordinary skill in manufacture and in timing within the movement. It is regulating the balance wheel in the 101 movement that contains the greatest degree of difficulty.

[Manufacturing the balance wheel and fitting the balance spring. Note the conical shaped balance spring and balance wheel for the Gyrotourbillon 2 alongside the 101 equivalent. Only one person, with one set of tools makes both at Jaeger LeCoultre]

Though the movement is not a limited edition in the strictest sense, the production is certainly limited, with only 50 (as a maximum) able to be made each year. In terms of production, the quantities are small. The official numbers from the Jaeger LeCoultre archives show that between 1929 and 1994 the total production was 1646 movements; or approximately 22 watches a year. For such a basic movement, innovations and progress have been made occasionally and every so often.

[A 101 movement on a watchmakers bench: note the almost cartoon like magnifying glasses attached to the spectacles – top right of the photo – that are needed to work on the smallest of mechanical movements.]

Improvements on the movement have been slight and only in the detail. Where as in 1929 Jaeger managed to fit 74 parts into the movement the current day total is 98. No one is too sure where the additional 24 parts have been placed (including several watchmakers and the Jaeger LeCoutlre historian). Over lunch, Stephane Belmont mused that he was not sure where you might fit an extra 24 parts, but they were necessary to improve the movement. The process of increased tolerances on the metal components, a main spring with improved capacity, a balance spring with a more consistent degree of oscillation, gear components that are slightly thinner and stronger, the watch design and layout remains the same.

[A modern incorporation of the 101 movement into a Reverso case from the last decade]

In 1961 the movement incorporated a new way of using rubies: pressing the rubies into the plate rather than a gem-setting method. In 1966 the balance wheel with screws was replaced by a ring balance wheel made from gold. It aided efficiency and time keeping with the movement. In addition an anti-shock system to the escapement was also fitted (that resulted in an extra 8 parts). In 1982 the gear train was re-designed for the first time since 1929; and by 1983 the plates for the movement were now cut using CNC machines (whereas before they had been cut with cutting machines controlled by hand). Finally, in 1991, under the auspices of Sylvain Golay (who was the head watchmaker at Jaeger LeCoultre at the time), a skeltetonized version was made.

[The modern state of the art for the 101: diamond inlaid case and bracelet]

Although it is hard to comprehend, the whole movement only weighs 1 gram; and if you can believe it, the skeleton version weighs .78 of a gram. Because the parts for the gear train are so small, specialist manufacturing techniques are required. The wheel groves have to be cut before the wheel can be separated from the rest of the tube. The work is painstakingly slow and a wheel production run is a 'by hand' task that takes a day to come up with the basic wheels. The wheels then have to be finished. In an instance where the past truly does inform the present, the watchmakers working on the past pieces use the knowledge they gain from repair to inform the current production of where improvements can be made. The most recent improvements have come in the time setting crown movements.

[A modern 101 with inlaid diamond case and silk strap. The winding crown on the reverse side of the case]

What is special about the 101 is not the royal patronage, or the fact that it was and is the smallest mechanical movement in production, it is that the watches that use the 101 movement are still as audacious and avant-garde as they were when first made. Age does not temper them, nor use diminish their lustre. The 101 watches are still unique in every sense; a demonstration of absolute discretion and watchmaking skill. As the gift of a 101 to Her Majesty demonstrated, the passage of time has had little impact on the serenity and grace of her office. Even after 81 years, the Calibre 101 continues to be a micromechanical wonder, retaining a freshness and beauty in modern times while hearkening back to an earlier era.

This year, for a short while at the Jaeger Le Coultre Boutique on Bond Street there is a small exhibition on the 101 in the upstairs gallery. In the exhibition there were vintage pieces as well as a display of some of the more recent incarnations of the 101 watch. Before ‘bling’ was a necessary accessory to get you noticed the 101 provided a simple and discreet ‘WOW’ factor! With the passing of time, nothing has diminished the lustre of the workmanship or the astonishment that the watch movement is mechanical. There is a lost age of excellence in watchmaking and joaillerie that still continues with the Jaeger LeCoultre 101. Long may it continue and reign!

Andrew H This message has been edited by 219 on 2012-08-13 22:58:10 This message has been edited by AnthonyTsai on 2012-08-14 09:55:33 This message has been edited by amanico on 2012-08-18 05:42:29

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Thank you very much for this review...

 By: Sandgroper : August 12th, 2012-17:08
absolutely fascinating. I find it so bizarre that JLC is not mentioned in the same breath as the other "big 3", surely it is more innovative and certainly has designed and manufactured more movements in more forms than all the other 3 put together. Bravo ... 

Could not agree more. I always wondered the same

 By: 219 : August 16th, 2012-07:08
myself. Here is the crux that I cannot get my head around. For years, JLC movements were the base ebauche behind some of the big 3, and only because of the endless posturing on finishing did the big 3 reputation remain. The horological brains behind it la... 

Great presentation!

 By: blomman Mr Blue : August 13th, 2012-08:04
Thank you, Andrew! Awesome photos and write up. Thank you for sharing! :) Best Blomman

Really a GREAT post, Andrew...

 By: watchme : August 13th, 2012-08:54
and it gives JLC just one more reason to shine in the horological universe. Though I doubt we'll ever see wristwatches using such small dials, I can foresee pendant watches, ring watches making occasional re-issues for those who don't want to "wear" a wri... 

Still the same way. A couple of watchmakers are

 By: 219 : August 16th, 2012-07:12
qualified enough to work on the 101. There are some pieces at Boutiques, but otherwise, it is by order only. Something of an unsung heroine for the JLC line up. Must be one of the longest running series in near continuous production. Pre-dates Reverso and... 

Thank you Andrew!

 By: Dje : August 13th, 2012-13:24
Hi Andrew, Thank you for this very interesting read about a so much under rated marvel! I'd love to offer a 101 to my wife someday (and the extreme opposite Atmos Newson to myself). Best Dje

You and your wife have very similar tastes to my wife and myself...

 By: 219 : August 16th, 2012-07:13
would go with the same choices! :) Andrew H

Thanks foversta! nt.

 By: 219 : August 16th, 2012-07:13

Thank you Andrew

 By: W72 : August 13th, 2012-17:03
for this very informative post. One gets to know so many new things everyday from this forum. I couldn't imagine that there is only one person with one set of tool making the balance spring and wheel for the Gyro2 and 101. The next time I get to see a 101... 

Thanks! That was the idea behind the article - to bring

 By: 219 : August 16th, 2012-07:16
to light the difficulties with such a movement. And true, there is one person with the required skills. Hence production numbers being so low. I found it heartening that JLC still preserve so much of the skills required despite the cost. Thanks again Andr... 

Superb post.Thank you...

 By: Ares501 - Mr Green : August 14th, 2012-00:38
for this galore of info on smallest movement ever Kudos to you and JLC Best regards Damjan

Yes, this article had certain personal costs in terms of

 By: 219 : August 16th, 2012-07:17
my better half.... :) Andrew H

Superb presentation Andrew!

 By: jporos : August 14th, 2012-11:47
This is a major reason why I frequent PuristPro; the incredible wealth of knowledge and research. Thank you sir!

Thanks for this interesting report...

 By: DonCorson : August 14th, 2012-13:14
I saw some of these movements at JLC and just imagining working on something this small gives me a headache. But it is marvelous. Don

Imagine! The camera had trouble with the autofocus the parts

 By: 219 : August 16th, 2012-07:19
were so small! Did marvel at the special spectacle attachments! Looked like the toy restoration guy out of Toy Story 2! Andrew H

Great post on a small movement

 By: Maverik : August 14th, 2012-13:29
Thank for your great post. Probably a very underrated movement amongst the all the powerhouses discussed here. Unbelievable how such a small piece can function. Although not for my wrist I'm very much in love with the Reverso 101. It really sets the case ... 

The Reverso 101 really did stand out for design and

 By: 219 : August 16th, 2012-07:25
the work on the movement. The work on the movement was from Sylvain Golay's design when he produced a skeleton movement. Sylvain has since retired, but lives near by the manufacture. A character for all those who met him at JLC. Shows how 'old' skills can... 

I want a pair of those cufflinks!

 By: marcelo : August 14th, 2012-18:28

Cool aren't they! From a time when discretion and

 By: 219 : August 16th, 2012-07:26
concealment were lauded rather than the necessity to wear the biggest and/or the brightest! Would love to find a pair at auction. Andrew H

Actually, those cufflinks have a caliber 104, not cal 101

 By: GregB : September 6th, 2012-12:29
The platinum cufflinks pictured in your post once belonged to me and were sold a few years ago to the JLC Heritage Gallery. The watch inside the cufflink was actually an unmarked caliber 104..... much rarer than the caliber 101 and only a fraction larger.... 

Great to read you, Greg! It was an eternity. Thanks for the information, my friend.

 By: amanico : September 6th, 2012-14:00
Nothing is better than the source! ;) Best, Nicolas

Try again.....

 By: GregB : September 9th, 2012-16:22
a picture of the caliber 104 movement inside the cufflinks another picture of the platinum cufflinks ...  

Superb presentation of a wonderful artifact...

 By: Ornatus-Mundi : August 14th, 2012-23:35
very well done in both text and images. I did not know that the same specialists work on the 101 as well as on the Gyrotourbillon. This stresses the fact that miniaturisation is an often overlooked complication. Again, thanks for taking the time to presen... 

Thanks Magnus - much appreciated. If you look on the

 By: 219 : August 16th, 2012-07:29
watchmakers bench, you can see part of the Gyrotourbillon dial. He was working on both at the same time! Also on the bench is his own design of cover for the 101 movement as others did not fit over the special vice to hold the movement! It really is that ... 

Great piece

 By: Greg D : August 15th, 2012-00:27
Thanks Andrew - a great piece on one of my favorite movements. Amazing how rare they are in the used market. Have kept my eye out for the Reverso 101 - but have failed to see one yet. And those cufflinks are amazing. Where did you come across the cufflink... 

In the MJLC Museum! They allowed me special access

 By: 219 : August 16th, 2012-07:31
with the Curator. I was allowed to see designs/watches/movements. Fascinating stuff. Andrew H

Thanks for the post about an amazing calibre Andrew

 By: rovermark : August 15th, 2012-22:38
I had the pleasure of seeing a pair of 101 cufflinks (possibly the same ones) in person a few years back. They're fantastic. Of course with a 101 movement inside how could they be anything else. Last year I almost bid on a platinum women's watch just for ... 

I think JLC should give the cufflinks some thought...

 By: 219 : August 16th, 2012-07:33
something out of the ordinary. Perhaps for 2014 for the 85th anniversary of the movement! Start lobbying now! Would take that long just to get a special edition of (say) 25 into the market because of the production possibilities on the movement!! Andrew H... 

A jewel of an article, Andrew.

 By: amanico : August 16th, 2012-05:51
The Cal 101 deserved such a post. I was thinking about working on it, you made it, in a brilliant way. And to include a picture of a modern Reverso displaying this movement should lead JLC to think about a non jewelled version, in an " Ultra Thin " case. ... 

Thanks Nicolas. Given QEII involvement with the watch

 By: 219 : August 16th, 2012-07:34
and this being the Diamond jubilee - it seemed fitting to write to celebrate the watch and movement now. Thanks for the kind words and hope to see you soon. Andrew H

Brilliant post Andrew

 By: damien : August 17th, 2012-20:05
We sometimes let the small things slip by in awe of the next multi-axis/quintuple complication. The watchmakers behind the 101 and the production numbers are quite a revelation. The men's cuff links are very nice. With a good designer, and I'm afraid the ... 

Thanks Damien. Always thought the 101 was a bit of

 By: 219 : August 19th, 2012-12:15
an unsung hero(ine). Appreciate the kind words. Andrew H

even lezen [nt]

 By: m.p.derksvandeven : August 23rd, 2012-06:06

Another 101

 By: Quovadis : December 23rd, 2016-09:08
Pity I cannot see behind the Queen's watch to see any writings or marks behind the casing. I have a feeling this was an early prototype model 101, EJ licensed to some other jeweler. I would love to compare to a watch I have here. This one has no markings ...