Question About the Patek Philippe 3940

Sep 14, 2020,21:25 PM

During my enforced “Down Time” because of the pandemic, I have been reading-up and studying whatever I can find about vintage Patek Philippe. The early Perpetual Calendars and Perpetual Calendar Chronographs were made by Patek Philippe utilizing different components and ebauche movements from companies like Valjoux and Victorin Piguet and later from Nouvelle LaMania. Patek Philippe would modify these components as needed and finish them beautifully and incorporate them into the 1518, 1526, 2497, 2499 3970, Etc. I have also read that they used different watch case making specialist firms as well. 

 I have read no mention as to who made the ebauche or the Perpetual calendar mechanism for the 3940,.Does anybody know? Patek was using Nouvelle LeMania components for certain aspects of the 3970. Did they make everything in house for the 3940?  Somebody here on the Forum has insight into this era of Patek Philippe manufacturing. 
Many thanks! 

More posts: 151815262497249939403970grand complications

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I guess

 By: baufoam : September 14th, 2020-23:03
What I am asking is, did Patek make the 240 movement entirely in house?

What’s reasoning for not having a seconds indicator for the 240 caliber

 By: pongster : September 14th, 2020-23:56
Up to now they still use it for the 5327 even with the bigger case.

If seconds indicator

 By: lascases : September 15th, 2020-01:16
in the usual spot this would have increase the height of the movement. 240 is super flat.

Ah ok. So it’s a tradeoff for being thin.

 By: pongster : September 15th, 2020-04:53
I’d pick the thin as well. How is JLC able to do it with its MUT?

To my knowledge

 By: lascases : September 15th, 2020-01:15

yes the cal 240 is in-house

 By: liborguy : September 15th, 2020-17:42
yes the cal 240 is in-house- there are many articles about the innovations of this movement including one pasted below. the development of the cal 240 and the PP3940 in the 1980s was a bold and risky move (during a time when the trend was to make battery ... 

Many Thanks!

 By: baufoam : September 15th, 2020-20:04
There is also an interesting article very specific to the 3940 available online at “The Collected Man” website. I just found it. They talk about the case suppliers for the 3940 along with its entire history of manufacture. Fortunately , there were around ... 

3940 is not a humble piece!

 By: lascases : September 16th, 2020-00:01
It is one of the very best and most important pieces in Patek‘s history!


 By: liborguy : September 16th, 2020-06:16
the article omits some other information that i received from john reardon international head of watches at christies, in that despite the 7,000 production numbers there are some variants/ color metals that are indeed quite rare. the rose gold for example... 

It is an interesting article

 By: DOCSF : September 16th, 2020-09:09
However nothing was mentioned about the 3940J and 3940R produced after the London exhibition using the 5140 dial layout.