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Individually Swiss Handcrafted
Serial numbers beginning with 6BB were issued to the Royal Air Force
dating the watch to 1963 and inside marked Hamilton W
keeps excellent time
and Swiss Made T below the 6 position
Fortis Easy Math Slide Rule Compass Watch BRAND_Zodiac Individually Swiss HandcraftedOffered is this Fortis Easy Math Watch that winds, sets, and runs great. It keeps excellent time. The crown at 2 operates the internal rotating bezel and second crystal below the watch crystal that is seated into the rotating bezel so that the compass points and minute timer may be rotated as well. The outer portion of the internal bezel functions as a slide rule (as in the Breitling Navitimer). The gray portion of the rotating crystal can be used as
