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This is a 1960’s Hamilton automatic chronograph (using the same configuration as BREITLING and HEUER movements of the era) is similar to cal. 11 or 12 HEUER… very first automatic winding chronograph movement! The steel case with screw back measures 36.5x40mm…13.5mm. thick. The shimmering case was untouched…never polished…like new old stock with signed “logo” crown. The original White dial with black sub-registers looks fabulous with its’ stark contrast… those tiny “dust-looking” marks in the picture above were marks on the crystal that have been perfectly polished away! The automatic winding movement was just cleaned and overhauled…functioning flawlessly. A very collectable and striking looking HAMILTON CHRONOGRAPH watch.