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Twenty-Four Hours

Introduced: 2011 (reissue of a 1950s model)

Purpose / Inspiration: The Twenty-Four Hours model is a modern remake of a 1950s pilot watch made specifically for Swissair navigators. The original used a 24-hour dial because pilots operating under coordinated universal time (UTC) needed to distinguish day from night easily. Longines brought it back for purists, aviation collectors, and those who appreciate functional oddities.

Designer: Recreated by the Longines Heritage team based on the original Longines ref. 6105, made for cockpit use

Case size:

  • 47.5mm (just like the original)
  • Big for legibility and wrist presence—worn more as a statement tool watch than a daily beater

Case options:

  • Stainless steel only
  • Polished bezel with brushed mid-case
  • Sapphire crystal front and back
  • Screw-down crown

Powered by:

  • Automatic movement
    • Caliber L704.3 (ETA A07.171): modified to run on a 24-hour scale
    • Central hour hand does one full rotation per day, not two
    • 48-hour power reserve
    • COSC-level reliability, though not officially certified

Bezel:

  • Fixed polished bezel
  • Clean and slim to emphasize the oversized dial

Dial options:

  • Matte black only (just like the original)
  • Large painted Arabic numerals 1–24
  • Railroad minute track
  • Blued steel cathedral hands with lume
  • Red-tipped seconds hand for readability

Water resistance: 30m

Bracelet:

  • Brown or black alligator leather strap
  • Large 22mm–24mm width for proportion
  • Pin buckle, no bracelet option
  • Strap designed to sit flush against large case

Discontinued, but still available on the secondary market—valued by aviation and military collectors, especially those into GMT and 24h complications

Why it matters: This isn’t a marketing watch—it’s a real tool from Longines’ flight deck past, faithfully rebuilt. It’s odd, oversized, and unapologetically functional. If you want something few others are wearing (or even understand), this is that piece.

24 Hours. No Nonsense. Just Like the Original.

Built for the Cockpit, Not the Conference Room

One Full Rotation Per Day. Because Pilots Don’t Guess.

The Opposite of a Trend Watch—And That’s Why It Works

References for Twenty-Four Hours