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Please limit discussion to items of horological interest. You may post links to sites with educational content, but please no links to competing sites with similar items for sale. You must register to use any of the fora.
Hi.
As far as i know, it is a cal 412 (uniplan) from 1940.
I have two, one of them in gold with copper color dial, and one in steel.
Mostly small diameter (30 mm).
Hope this help.
Best regards.