UROFA 59 hidden serial number?

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Hi specialists, quick question: does the UROFA 59 movement have a "hidden" serial number besides the 6digit one (movement and case)? Not on the dial-side.

Looking for infos on www (ranfft etc) : am I wrong? -> Does anyone own the Knirim-book??

Merci, Jo

@watchyouwant (probably) 馃槈
 
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Hey Jo,

would be new to me. The 6 digit Serial number should be the only one to my knowledge.

Nico
 
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I am no expert on these and I am allways eager to learn something new 馃榿 I havnt heard or read something like this before.
 
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I guess, it is solved: there are 4 digits on the post-1945-calibers "Made in Moscow". SRY...