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I don't wear it anymore, i let it in a safe

Have in Chrono24

That's flattering to say that the movement looks more of a pocket watch. This movement is not a 12-120 but looks like this one, made André Zibach a famous watchmaker of PP inventor of the Gyromax balance, I send the link

So what is the ref. ? 96?

Yes is probably a 96 or 437 steel of 1930's but the particularity is that have no ref number stamped and the movement is not a 12-120PS

Yes but as you see in the case back have no ref number, only the case number followed by 13 and FB stamp wich is François Borel case maker. Me too I look for more information about this model because it's not a ref. 96 and the movement is not a 12-120PS or even a Le Coultre ébauche of the 96 first s

I need help to identify this early Calatrava in Staybrite steel stamped in the case back FB François Borgel the famous case maker of the beginning of the 20th century, normally known for waterproof Calatrava Ref. 565, 437, 1463, pionnier of the water resistance in watchmaking. The 9" caliber looks i