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SIZE: 35mm without crown
It is a really nice addition to the watch
The larger size goes well with today's fashion of larger watches
and the case appears to have never been polished
Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Wittnauer SIZE: 35mm without crownOffered is this very 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 production to be
