Aluminum is relatively strong and lightweight, which is why it's often used in aviation. Hamilton pays homage to the material with its Pilot Pioneer Watch. Its 41mm case is made from green aluminum, giving it a decidedly military vibe. That's continued by the Arabic numerals on the green dial, which are surrounded by a silver 24-hour ring, a reverse 60-minute outer ring, and augmented by a date window at 3 o'clock. The automatic movement offers a robust 80-hour power reserve, and the timepiece is finished off with a partially leather-coated NATO strap with an aluminum pin buckle.