Cal 31(09…), 39 jewels, 21800 A/h, 40h power reserve, automatic with two roller freewheels, regulation gear – rotor reserve (3209880)
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Girard-Perregaux_31
Stem W2837
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09 / Girard Perregaux movements, Automatic
Girard Perregaux – GYROMATIC, 31(09682), 39 JEWELS – WORKED
VinMov / Serbia GS 