The Longines Master Collection L2.773.4.78.3 is a highly complicated 42mm mechanical timepiece featuring a moonphase, triple calendar (day, date, and month), and a chronograph. The 2023 version typically utilizes the updated Calibre L687 movement, which provides a longer power reserve of up to 66 hours compared to earlier iterations.

• Triple Calendar & Moonphase: Displays the day and month in windows below 12 o'clock, the date via a central half-moon pointer hand, and the moonphase at 6 o'clock.

• Aesthetic: Features a signature silver "barleycorn" dial with painted Arabic numerals and heat-blued steel leaf-shaped hands.

• Case & Crystal: The 42mm stainless steel case has a thickness of approximately 14.2mm and is protected by scratch-resistant sapphire crystal on both the front and the exhibition caseback.

• Strap: Comes on a brown alligator leather strap with a triple-safety folding clasp and push-piece opening mechanism.