Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono

The Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono, reference H76409540, is a 40 mm steel chronograph water resistant to 100 metres. Under sapphire crystal, the blue sunray dial carries small seconds. Measuring 14.35 mm thick and 50 mm from lug to lug, the case has 22 mm lugs for a leather strap with a pin buckle. A silicon balance spring regulates hand-wound calibre H-51-Si, whose power reserve is 60 hours.