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Girard Perregaux

G-P Gyromatic 39J

 

My Gyromatic ref: 7317 will change date backwards and forwards by the crown turning through 24 hours at a time either backwards or forwards - tedious but slightly less than some other slow forward-only date changers eg Omega calibre 561.   It was 1957-58 I suppose.   Easier to wait until close to when the real date arrives.

Best

Clive

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