Note: I'm fairly new on this forum and my native language is Dutch. Please let me know if I can improve something. I've searched on the web and found the history stated as below. If there're any false statements, please let me know!
Recently I came across a Girard-Perregaux - Gyromatic:
The watch:
This is a Girard-Perregaux Gyromatic ref. 7317 from around 1958. This model houses a caliber 21, 18.000 vph, with 39 jewels. With a diameter of 34mm and lugsize of 18mm it wears very comfortable. Unfortunately the crown isn't original anymore, but the case seems in good condition. The dial is difficult to capture, has a nice radium burn, applied indices and a very nice blue date wheel...
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