Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Waltham BAND/BRACELET: Brand New Genuine Leather

BAND/BRACELET:  Brand New Genuine Leather Black Strap with Matching Silver Tone Buckle

SIZE:  33mm without crown | 48mm lug to lug

and Sanders & Thomas of which an estimated 100 were made

and inside marked CB 702

Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Waltham BAND/BRACELET: Brand New Genuine LeatherHere's your chance to own a Super Rare Hamilton Electric PROTOTYPE 507 CALENDAR watch. Pictured in Ren Rondeau's book "The Watch Of The Future" on pages 92 93, it was planned in 1965 and 1966, but never released to the market. Approximately 25 of these prototype watches were produced, but concerns that an even more complicated watch would result in even greater service problems and the addition of thickness to an already thick 505 movement caused