John Hannover
4
GP Gyromatic, with 17 + 6 = 23 jewels Deep blue enamel
Can any of you who knows GP much better than I (I have been and are, collecting Eterna) say anything about this GP Gyromatic SS,
On the rotot it says Girard Perregaux 6 Jewels in Gyro unit, and the movement is marked 2119171. It has a deep blue enamel face with golden raised markers and just the text GP.
I would like to know when this can be from. I estimate around 1958-60. Any help to me in Denmark is welcomed
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