Hamilton Khaki Navy Frogman Auto

The Hamilton Khaki Navy Frogman Auto, reference H77455330, has a 41 mm steel case water resistant to 300 metres. A bridge-shaped crown guard surrounds the screw-down crown. The case measures 13.09 mm thick and has 20 mm lugs, with a waved rubber strap and a pin buckle. Central seconds cross the black dial beneath a sapphire crystal. Self-winding calibre H-10 has a Nivachron balance spring and an 80-hour power reserve.