Cal 31(09985), 17 jewels, 40h power reserve, automatic with two roller freewheels, ball-bearing rotor, worm screw regulation gear

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Girard-Perregaux_31_09

gp_31_09985gp_31_09985agp_31_09985b

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