Hamilton’s Khaki X-Wind introduced the first drift angle calculator ever to appear in a watch, a tool that helps pilots work out how crosswinds will push them off course. The Hamilton Khaki Aviation X-Wind Auto Chrono H77736733 takes that idea and gives it a stealth finish: a 45mm stainless steel case coated in black PVD, a black dial and a black leather strap.

This is a mechanical chronograph with real substance. The automatic H-21 caliber provides a 60-hour power reserve and adds day and date displays to the chronograph functions, and you can see it at work through the open caseback. A screw-down crown helps deliver 100 meters of water resistance, while sapphire crystal protects the dial.

At 45mm wide and 14.85mm thick, it’s a bold, technical watch that suits larger wrists and anyone who likes a watch with a lot going on. Hamilton describes the X-Wind as a technical piece that also suits urban aviators, and the all-black look makes it easy to wear with dark denim, a bomber jacket or evening clothes.

X-Wind Auto Chrono PVD H77736733 specs

• Case: 45mm stainless steel with black PVD coating, 14.85mm thick
• Dial: black with chronograph, day and date
• Feature: drift angle (crosswind) calculator
• Movement: Hamilton H-21 automatic chronograph
• Power reserve: 60 hours
• Crystal: sapphire; open caseback
• Water resistance: 10 bar (100m), screw-down crown
• Strap: black cow leather, pin buckle, 22mm lug width

An all-black aviation chronograph that does far more than look the part.