Hamilton Khaki Aviation Converter Auto Chrono

The Hamilton Khaki Aviation Converter Auto Chrono, reference H76746540, is a chronograph with a 44 mm steel case and screw-down crown. Day and date displays occupy the blue dial under sapphire crystal, with a tachymeter scale alongside. The 14.95 mm-thick case is water resistant to 100 metres, with a see-through back and 22 mm lugs for a leather strap with a pin buckle. Self-winding calibre H-21-Si maintains a 60-hour power reserve with a silicon balance spring. Conversions can be calculated with the bi-directional rotating slide-rule bezel.