Baume & Mercier, Bidynator, automatic, Felsa 690, 17 jewels, incabloc, sweep second, 44 h reserve, screw-fix micro regulator (Reed’s regulator).

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_690

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