Longines Master Collection Automatic 40 mm Blue Dial L27934920 watch

Master Collection Automatic 40 mm Blue Dial

The Longines Master Collection L27934920 is a 40 mm stainless steel automatic watch with a sunray blue dial and matching blue leather strap. It displays hours, minutes, seconds and a date at 3 o'clock. The exhibition caseback reveals the L888.5 calibre. It is intended for adult men seeking a luxury dress watch with Swiss mechanical movement.

30 m water resistance and leather strap

Water resistance is rated at 30 metres, which protects against splashes and brief immersion but not swimming or diving. The blue leather strap with 21 mm width and triple safety folding clasp is not designed for prolonged moisture exposure. Buyers who need a watch for water sports or high-humidity environments should consider a model with higher water resistance and a metal bracelet or rubber strap.

72-hour power reserve from calibre L888.5

The automatic movement beats at 25,200 vibrations per hour and stores up to 72 hours of energy when fully wound. If the watch remains unworn for longer than three days it will stop and require manual winding and time reset. Buyers who rotate multiple watches and cannot accept a three-day power reserve should look for a movement with longer autonomy.