Hamilton built the Khaki Aviation Pilot Day Date Auto H64635560 for true aviation lovers, and this version wears its outdoor roots openly: an olive green dial set against a dark brown cow leather strap. It’s the color pairing of vintage flight jackets and canvas kit bags, rendered in a crisp 42mm stainless steel case.

The dial keeps the classic pilot formula intact, with enlarged numerals for quick reading, Super-LumiNova for low light, and a day-date window for everyday use. Powering it is Hamilton’s automatic H-30 caliber, which delivers an 80-hour power reserve and uses a Nivachron balance spring for better resistance to magnetism and temperature changes. An open caseback shows the movement in action.

The strap uses Hamilton’s Easy Click system with an H-Buckle, so trading the leather for another strap takes seconds. At 12.1mm thick with 100 meters of water resistance, it’s a relaxed, earthy alternative to black or blue dials that pairs naturally with denim, khakis and tweed.

Green-dial Pilot Day Date H64635560 specs

• Case: 42mm stainless steel, 12.1mm thick
• Dial: olive green, enlarged numerals, Super-LumiNova, day-date
• Movement: Hamilton H-30 automatic, Nivachron balance spring
• Power reserve: 80 hours
• Crystal: sapphire, anti-reflective coating
• Caseback: open
• Water resistance: 10 bar (100m / 145 psi)
• Strap: dark brown cow leather, Easy Click, H-Buckle, 20mm lugs

Earthy tones, aviation heritage and three-plus days of power reserve in one easy watch.