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Jaeger-LeCoultre

In Nico's pics above the steel UT movement (photo #45) does not have the bridge either

 

while the steel True Second movement (photo #30) does have the bridge. Since both movements use cal. 770 as a base calibre the base plates should be interchangeable. Perhaps some True Second watches were assembled with UT base plates? Or maybe they are as you say and the earliest production models (for both references) don't have this bridge.



However, photos #12 and #18 clearly show the cal. 770 without this bridge so it looks like the early movements don't have them.  Ah, the minutiae details!
This message has been edited by reintitan on 2015-09-30 19:22:31

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