Girard Perregaux, automatic, cal 41-293, High Beat (36000 A/h), Gyromatic, 17 jewels, Chronometer no. 21447, hack feature, micrometer regulator with adjustable hairspring gap

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Girard-Perregaux_440

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