Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Wittnauer so that the Spaceview case

so that the Spaceview case appears to "float" between the strap ends

According to Paul Frankenfeld

and the case appears to have never been polished

This is a great looking Mint Wittnauer Automatic Watch that winds

It is a really nice addition to the watch

Hamilton Electric 507 Calendar PROTOTYPE Watch BRAND_Wittnauer so that the Spaceview caseOffered 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