Any input on the "pressure case" you stated in earlier posts that was introduced by GP in 1968/1970. Did GP make any Gyromatic Chronometers HF with the 39j,36000, caliber 42 usinf this so special "pressure case"? Any scans or ref. nos available? Tks Nikos
Good Day, I am doing research on this vintage marvel of horology: GP GYROMATIC CHRONOMETER HF, 39j, 36000 bph, caliber 42 with "suspension case" that GP introduced in 1968/70 I would really appreciate if Peter and other GP gurus could email me with detailed history info and or articles on above as w