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keeps excellent time
Serial numbers beginning with 6BB were issued to the Royal Air Force
it has been updated to a 505 movement
dating the watch to 1963 and inside marked Hamilton W
It is a large sized watch
Fortis Easy Math Slide Rule Compass Watch BRAND_Zodiac keeps excellent timeOffered 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
