
Nicolas (amanico) initiates a fascinating visual comparison, drawing attention to the striking similarities between the Patek Philippe Tourbillon Observatoire and the Jaeger-LeCoultre Caliber 170. His post invites collectors to delve into the historical context of these movements, both renowned for their chronometry contest victories in the late 1940s. This exploration uncovers potential shared heritage or design influences within high horology.


Thats for me reason enough to buy a jacket, that has a pocket for a pocket watch
are beautiful 🤩! Which do you prefer ?
the VC 145, I think, but I could be wrong. Interesting that JLC added 3 jewels. I hadn't seen any examples of JLC's tourbillon in a Patek. Thanks for showing. -Dean
andre bornand did make a pocket watch that was similar to the 3699 caliber but they have a "bornand" cage in copper beryllium rather than the cage made in steel in the jlc 170. However, i do think JLC made the school watch ebauches which were very similar to the 170 made with the 170 cage or a grether type 3 cage and sometimes had twin barrels. These ebauches were used by Urban jurgensen, Jean pierre hagmann and Antoine Preziuso who weirdly used it in a few wristwatches as well.
Bornand made it himself not using any base. He also constructed the caliber 34T for patek
...'50s? '60s? '70s? Never?
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