Hamilton Jazzmaster Open Heart Auto

The Hamilton Jazzmaster Open Heart Auto, reference H32705731, has a steel case measuring 42 mm across, water resistant to 50 metres. Beneath sapphire, central seconds cross the black dial beside an opening that reveals the mechanism. Calibre H-10 stores an 80-hour power reserve through self-winding operation. A see-through back closes the case, measuring 11.44 mm thick and 50 mm from lug to lug on a calfskin strap with 22 mm lugs and a folding clasp.