Hamilton Watch Khaki Aviation Pilot Pioneer H76719530. Inspired by the Model 23, a cutting-edge pocket watch used by U.S. soldiers during WWII, the Khaki Pilot Pioneer's distinctive design is a tribute to Hamilton's aviation and military heritage. The sporty yet refined pilot watch retains an indisputably technical feel with its handwinding mechanical movement, bi-directional rotating bezel and prominent winding crown. Available with a sleek stainless steel or unique bronze case, this 43mm timepiece is ready to fly.