Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Waltham and Sanders & Thomas of

and Sanders & Thomas of which an estimated 100 were made

This is one of the high quality examples using a solid stainless steel case

CASE:  14K Solid Gold

refinished

and Pointer Seconds Hand

Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Waltham and Sanders & Thomas ofHere'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