The Hamilton Khaki Aviation X-Wind Auto Chrono (Reference H77726351) is a high-performance, aviation-focused 45mm automatic Swiss watch, Limited 1999 p. Designed for specialized piloting tasks, it is famous for containing the world's first drift angle calculator built directly into a mechanical wristwatch.

  This watch features an unmissable wrist presence due to its unique crown layout: the primary time-setting crown and chronograph pushers are located on the left side, while the right side houses the crowns that manipulate the internal aviation bezel rings. This architectural styling was notably featured on the screen in the 2019 television production Raising Dion, where it was worn by the character Mark Warren (played by Michael B. Jordan).

• Movement: Automatic Chronograph, powered by the Hamilton H-21 caliber (60-hour power reserve).

• Case Dimensions: 45mm diameter and 15.4mm thickness.

• Case Material: Silver-tone stainless steel with a transparent open case back.

• Dial: Multilevel silver 3D-effect dial with black symmetrical sub-dials and luminous hands.

• Functions: Chronograph (60-second, 30-minute, 12-hour sub-dials), Day, and Date window positioned at 9 o'clock.

• Aviation Features: Bi-directional rotating exterior black top-ring bezel synced with two interior rotating bezels for crosswind and drift angle calculations.

• Crystal: Scratch-resistant sapphire crystal with anti-reflective coating.

• Strap: 22mm black rubber strap secured with a stainless steel tang/pin buckle.

• Water Resistance: 10 bar / 100 meters (330 feet), equipped with a secure screw-down crown.