Longines - Ultra-Chron Classic 37 mm COSC Certified Automatic Date - L25374726

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In 1968, LONGINES launched the Ultra-Chron Diver, the first dive watch equipped with a high-frequency movement. At the time, LONGINES had already established itself as a pioneer in high-frequency technology. As early as 1910, the winged hourglass brand created the first high-frequency timekeeping device capable of measuring 1/10th of a second. In 1959, LONGINES developed the first high-beat movement for a wristwatch, an observatory chronometer that set new records in terms of accuracy. The new Ultra-Chron is inspired by the aesthetic codes and professional diving features of the 1968 model. These chronometer-certified watches are powered by an exclusive LONGINES calibre equipped with a silicon balance-spring and resistant to magnetic fields.

Case
Shape: Round
Material: Stainless steel
Glass: Scratch-resistant sapphire crystal, with several layers 
of anti-reflective coating on both sides
Dimension: 37 mm
Lug distance: 19 mm
Lug-to-lug: 44.6 mm
Thickness: 10.95 mm
Water Resistance: 50 meters
Weight: 122 g

Dial & Hands
Dial color: Sunray silver
Hour markers: Applied indexes
Hands: Silvered polished hands

Movement & Functions
Type: Automatic
Functions: Hours, minutes, seconds and date
Caliber: L836
Movement Description
Self winding mechanical movement beating at 36'000 vibrations 
per hour, with a monocrystalline silicon balance-spring power 
reserve up to 52 hours

Bracelet
Material: Stainless steel
Buckle: With double security folding clasp with micro adjustment system

Magnetic resistant: Yes
Chronometer Officially Certified: Yes

L2.537.4.72.6 Longines
L25374726 Longines