LONGINES ULTRA-CHRON CLASSIC watch, SILVER DIAL, 37mm - L25374726

LONGINES SPIRIT PILOT FLYBACK, L3.721.4.53.6, manual-winding watch, Ø 39.50 mm, stainless steel and ceramic bezel.
Flyback chronograph, mechanical movement with manual winding beating at 28'800 vibrations per hour, with a power reserve of approximately 68 hours.
Bidirectional rotating bezel, water resistant up to 10 bar, scratch-resistant sapphire crystal with multilayer anti-reflective treatment on both sides.
Matte black dial, Swiss Super-Luminova®.
Stainless steel bracelet, with double safety deployment clasp with micro-adjustment system.

ULTRA-CHRON CLASSIC, L2.537.4.72.6, automatic watch, Ø 37.00 mm, stainless steel.

Date, self-winding mechanical movement with a frequency of 36,000 vibrations per hour and a power reserve of approximately 52 hours, monocrystalline silicon balance spring.
Water resistant up to 5 bar, scratch-resistant sapphire crystal with multilayer anti-reflective treatment on both sides.
Silver sunray dial.
Stainless steel bracelet, with double safety deployment clasp with micro-adjustment system.

ULTRA-CHRON
In 1968, LONGINES launched the Ultra-Chron Diver, the first diving watch equipped with a high-frequency movement. By that time, LONGINES had already established itself as a pioneer of high-frequency technology. As early as 1914, the winged hourglass brand created the first high-frequency timing device capable of measuring 1/10th of a second. In 1959, LONGINES developed the first high-frequency movement for wristwatches, an observatory chronometer that set new records in terms of precision. The new Ultra-Chron draws inspiration from the aesthetic codes and professional diving features of the 1968 model. These chronometer-certified watches are powered by an exclusive LONGINES caliber equipped with a silicon balance spring and resistant to magnetic fields.

EARNINGS
Round Shape
Material Stainless steel
Scratch-resistant sapphire crystal with multi-layer anti-reflective treatment on both sides
Dimensions Ø 37.00 mm
Distance between lugs 19 mm
From lug to lug 44.60 mm
Thickness 10.95 mm
Water resistance Waterproof up to 5 bar
Weight 122.0 g

DIAL AND HANDS
Dial Color: Silver Sunray
Hour markers Applied indexes
Polished silver hands

MOVEMENT AND FUNCTIONS
Movement type Automatic
Function Hours, minutes, seconds and date
Caliber L836
Description of the self-winding mechanical movement with a frequency of 36,000 vibrations per hour and a power reserve of approximately 52 hours, monocrystalline silicon balance spring

STRAP
Material Stainless steel
Buckle with double safety deployment clasp with micro-adjustment system

GENERAL
Antimagnetic Yes
Chronometer Officially Certified Yes
Official Longines guarantee valid for 5 years