Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono

The Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono, reference H76409140, is a chronograph with a 40 mm steel case water resistant to 100 metres. A sapphire crystal covers the blue dial with its sunray finish. The case measures 14.35 mm thick and 50 mm from lug to lug, with a steel bracelet and folding clasp at the 22 mm lugs. Hand-wound calibre H-51-Si retains a 60-hour power reserve and a silicon balance spring.