Patek Philippe 12-600 Collection & Movement Guide
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Patek Philippe 12-600 Collection & Movement Guide

By watch-guy.com · Nov 2, 2014 · 9 replies
watch-guy.com
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Watch-guy.com delves into his Patek Philippe 12-600 collection, highlighting the Ref. 2552 as a significant addition. He explores the allure of collecting watches centered around a specific movement, offering a detailed analysis of the Patek Philippe 12-600 AT caliber and its historical significance.

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The 2552, the final ( I think ) link in my 12-600 collection 


I have written in the past about the different themes in my collection I have written about the Rolex Prince and also the rectangular Pateks with the 9-90 movement. I am going to cover the next part of my collection; the automatic Pateks with the spectacular 12-600 movement.


 I am not sure why I or other collect in groups. It does not really make sense to have one of each but as a collector I feel comfortable with my choices.
Collecting as many Prince types as I can or as many of the cases with 9-9- movements as I can afford to.

 Recently Roni and Joe have both shown pieces from the past. We have recently seen the new offerings from the 175 Anniversary.
 I know the company has to look forward but my own personal opinion is the glory days are in the past, especially with respect to design. Look at Roni’s fine collection of varied cases or Joe’s recent very simple but spectacular ref 3483. No one can fault the current series on the engineering prowess. Just look at the grandmaster Chime, caliber 89, the very fine ref 5959. 

Why this movement? The design and the marketing of the 12-600 fascinated me. The first Patek auto movement. The most over engineered movement. The best automatic movement. Hype or reality. 
 I do not have the expertise to judge but it sure is beautiful. 
 The reference numbers so far are 2526, 2540. 2552 2584 3415 
 Varied case designs, varied dial designs, all built around a sleek engine, which I will now analyse.


 Initially marketed as a self winding watch ( rather than the common automatic), all these watches seemed to share a common touch. The magnificent and bold double PP crown. It almost shouts Patek Philippe !!

Double PP crown

Double PP crown


Let’s looks at the movement The 12-600 AT stands for 
1/ 12 lignes diameter – approx. 27mm ( 1 ligne=2.256mm)
 2/ 600 – height of approx. 6mm 
3/ AT - automatic 

 30 Jewels 

18 kt sold gold rotor with a stunning guilloche pattern. Remember these watches do not have a display back. Most owners would never even see the movement let alone the rotor. A very nice touch. There are 2 jewels and a ball bearing here.

  Movement

Movement


Double wind action thus the main spring is wound much quicker and more efficiently 
The balance- patented Gyromax, with weights attached to the balance wheel for finer regulation allowing for a 4-5 second change. It also has a swan neck regulator. There are some articles which report that the earliest 12-600 did not have the Gyromax regulator but I could not confirm this.
 It beats at a rate of 19 800 beats per hour.
 The adjustment is for heat and cold, five positions and isochronism (regardless of how wide an angle the balance wheel describes, it will do in the same time period each time) 

 Self compensating Breguet balance spring.

 The movement is attached to the case by three screws not the usual two.

 According to records, only 7'100 movements cal. 12'''-600 AT have been made from 1953 to circa 1959 and were mounted in wristwatches bearing the references 2526, 2540, 2551, 2552, 2583, 2584, 2585, 3403, 3415, and 3425. From 1959, Ref. 3415, 3425, 3428, 3429, 3433, 3443, 3435, 3438, 3439, 3440, 3441, 3444 and 3454 were equipped with cal. 27-460 as well.Cal. 27-460 became the movement which was used for all automatic wristwatches and 27-460 Q for perpetual calendar wristwatches with automatic winding.Circa 1960, Ref. 2526 was equipped with cal 27-460, the latest automatic movement by Patek Philippe at the time and became the Ref. 3428. Here is a picture of my 12-600 collection . 
 Ref 2526

REf 2526

REf 2526


Ref 2540rg

Ref 2540 rg

Ref 2540 rg


Ref 2552

Ref 2552

Ref 2552


ref 2584

Ref 2584

Ref 2584


Ref 3415rg

ref 3415 rg

ref 3415 rg


The reference 3403 is most probably one of the smallest automatic wristwatches released with a diameter of only 32mm.

 I have also included a picture of my ref 3433. It has the 27-460 movement but an identical case to the ref 2551, Note how the angles and bezel is different on the two references. Some people describe both as “disco volante” or flying saucer but I feel the name should be reserved for the ref 2552 with the sharper edges. The 2551 has a rounder concave bezel, smaller lugs and softer edges. ( note condition is not as clean)

comparison of 2551 ( actually 3443) and 2552

comparison of 2551 ( actually 3443) and 2552


Here are 2 pictures of the collection The first without the ref 3443  and the second with.

collection

collection


collection incl 3443

collection incl 3443


Enjoy The movement of the ref 2526 was discussed in detail in a very fine article published by Michael Friedman online at Timezone. The article ‘The Perfect Watch” highlighted most of the features of probably the finest automatic movement ever made ( OK I embellished a little, here). If anyone has a copy I would love to have one. 

 Thanks . 

Information for this articles was gathered from various sources including 
 1. Walt Odets 
2. Arolex 
3. Oinkitt 
4. Huber and Banbery 
5. Collecting Patek Philippe wristwatches –Ozvaldo Patrizzi 
6. Antiquorum

About the Patek Philippe Calatrava Ref. 3440

The Calatrava reference 3440 is a notable example of Patek Philippe's automatic timepieces, distinguished by its integration of the caliber 12-600 movement. This reference belongs to a series of early automatic watches from the brand, which also includes references such as the 2526, 2540, 2552, 2584, and 3415. The 3440 is recognized for its refined design, aligning with the Calatrava's established aesthetic of understated sophistication, while housing a technically significant movement for the era.

The reference 3440 typically features a case crafted from precious metals, often yellow gold, with a diameter that reflects the sizing preferences of the mid-20th century. It is powered by the Patek Philippe caliber 12-600, an automatic movement that was the brand's first self-winding caliber. This movement is known for its robust engineering and high level of finishing. The watch is generally fitted with a sapphire crystal, providing clarity and scratch resistance.

For collectors, the reference 3440 represents a key period in Patek Philippe's development of automatic movements. Its connection to the caliber 12-600 makes it particularly appealing to those interested in the technical evolution of the brand's timepieces. The watch's design, while varied across different examples in terms of dial and case details, consistently maintains the classic Calatrava profile, making it a sought-after piece for enthusiasts of vintage Patek Philippe automatics.

Specifications

Caliber
12-600
Case
Yellow Gold
Diameter
36mm
Dial
Silver
Crystal
Sapphire

Key Points from the Discussion

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The Discussion
GE
geross
Nov 2, 2014
12-600 collection

i admire your collection. thanks for sharing. best geross

AM
amanico
Nov 2, 2014
Excellent review, my friend. A real pleasure to read. Thank you!

CI
cisco
Nov 2, 2014
Wow, beautiful collection

The 2526 is a beautiful classic, the irl feeling I had of this watch is everytime a special moment, the 2526 is perfection. and the 2552 is absolutely stunning , in such a good shape! Thanks for sharing. François

WA
watercolors
Nov 3, 2014
Thank you very much for.....

this learning experience!!! Many insighful and interesting points to know about the movements. Amazing gathering of vintage pateks. Congratulations. Regards Edward

BA
Baron - Mr Red
Nov 3, 2014
What a superb post!

Something hooks us....I am not sure what it is either....but something seems to hook us and it is always wonderful to both watch and experience. I often wonder whether an obsession starts out of necessity! For me, the bulk of my vintage watches are Rolex steel sports watches. If you had to pick one other manufacturer to collect alongside a vintage Rolex sports collection, Patek offers a beautiful and most logical foil. For me, the dedication to collecting 1960s Calatravas in various guises made

AN
Ancienne Le Brassus
Nov 3, 2014
superb collection!!! Thanks for sharing here! [nt]

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