The watch is powered by the L687.5 caliber, a self-winding mechanical movement featuring a column-wheel chronograph and a moon phase complication. The movement operates at a frequency of 28,800 vibrations per hour and provides a power reserve of approximately 66 hours.
The round stainless steel case has a diameter of 41.00 mm, a thickness of 13.80 mm, and a lug-to-lug width of 48.60 mm. Protected on the front by a scratch-resistant sapphire crystal with a multi-layer anti-reflective coating on both sides, the watch allows a view of the movement’s finishes through its transparent sapphire crystal case back. It is water-resistant to 3 bar and has a total weight of 153.0 g.
The dial features a refined silver “grains d’orge” pattern paired with applied Arabic numerals and blued steel hands. The intricate layout of the functions includes the central 60-second chronograph hand, the 30-minute counter with day and date at 12 o’clock, the moon phase indicator with a 12-hour counter at 6 o’clock, and the small seconds sub-dial with a 24-hour indicator at 9 o’clock. The peripheral date is displayed via a central crescent-shaped hand.
The bracelet is made entirely of stainless steel (with a 21-mm spacing between the links). It fastens to the wrist with a triple-security folding clasp featuring a push-to-open mechanism and an adjustment system for maximum everyday comfort.
Accompanied by packaging and official Longines 5-year warranty.






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