Hamilton Jazzmaster Open Heart Auto

The Hamilton Jazzmaster Open Heart Auto, reference H32675540, has a 40 mm steel case water resistant to 50 metres. Cut-outs reveal the mechanism through the smoked blue dial, with central seconds beneath a sapphire crystal. The case measures 11.05 mm thick with a see-through back, while its 20 mm lugs meet a leather strap with a pin buckle. A Nivachron balance spring regulates self-winding calibre H-10, which keeps an 80-hour power reserve.