http://www.oclock.info/vernisage/gal...d=3586&tid=248
Подсказку дал, отправляетесь на поиски в 56-ой год.
In 1956, the Egyptian Navy once again requested another supply from Panerai with higher waterproof specifications and the use of the crown protecting bridge and with the addition of a revolving bezel with 5 minute intervals (patented) for calculating immersion times, the back was closed with antimagnetic screws produced by Panerai, the caliber was the Angelus 240 8 day winding charge. So was born the ref GPF 2/56, about 60 examples were produced including the prototypes and the 50 assigned to the Egyptian Navy.
http://stefanomazzariol.blogspot.com...rai-story.html