Need Help Identifying Universal chronograph movement

[myk]

Hi all!
I need help identifying a Universal chronograph movement.Diameter 37 mm.
Thank you for your help!

 

[Bernhard J.]

Interesting logo above the "6".

 

[gmorse]

Hi myk,

Interesting logo above the "6".

According to Mikrolisk, this mark belonged to Perret & Berthoud SA in Genf, registered in 1929.

Regards,

Graham

 

[myk]

Thank you Graham !!! What the caliber ?

 

[roughbarked]

Does it have a flat hairspring or a Breguet hairspring? This and the size of the pillar plates are the only differences between certain calibres.
ie:
• 281...284 have only different pillar plate sizes
• 285, 287, 288, 292 have only different pillar plate sizes
• cal 381, like 281, but flat hairspring instead of Breguet hairspring
381, 383 have only different pillar plate sizes
That sort of thing but Ranfft doesn't list a 37mm dia. Which would be 16'''. Because Ranfft doesn't list it, doesn't mean it didn't exist.
However, when measuring diameter, attention should be paid to what Ranfft has to say about it here: Ranfft Watches, Infos

 

[John Cote]

My guess would be a Martel 16 (second series) which is more or less the same as the UG 339. Thanks to my friend GT from Florence Italy for this catalog page. Martel made movements for both Zenith and UG. In the end, in the late '50s or early '60s, I believe that Zenith bought Martel.

 

[myk]

Hairspring