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Montblanc

Caliber 13-20 perfectly finished

 

If I am not mistaken the first (old) calibre (before picture) is a Minerva calibre 13-20 and the (new) caliber (after picture)  is of the 47 mm monopusher.

Below is picture of my watch, one of the latest worked-up Minervas, just before it was sold to Montblanc, with same caliber 13-20

 

 

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