Longines Master Collection Chrono Moonphase

Case
Shape: Round
Material: Stainless steel
Glass: Scratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides
Case Back: Transparent case back with sapphire crystal
Dimension: Ø 42.00 mm
Lug distance: 21 mm
Lug-to-lug: 49.50 mm
Thickness: 14.20 mm
Water Resistance: Water-resistant to 3 bar
Weight: 102.9 g

Dial & Hands
Dial color: Silver
Hour markers: Applied Roman numerals
Hands: Blued steel hands

Movement & Functions
Movement Type: Automatic
Functions: Hours, minutes, small seconds with 24 hours indicator at 9 o'clock. Date indicated by the half moon central hand. Moon phase display at 6 o'clock.
Caliber: L687
Movement Description: Self-winding mechanical movement beating at 28'800 vibrations per hour, with a monocrystalline silicon balance-spring power reserve up to 66 hours
Special Functions: Moon-phase
Chronograph: Column Wheel Chronograph
Chronograph Functions: Chronograph mechanism: central 60 seconds hand, moon phase display with 12 hours counter at 6 o'clock and 30 minutes counter with day and month display at 12 o'clock

Strap
Material: Alligator strap
Color: Blue
Buckle: With triple safety folding clasp and push-piece opening mechanism

Reference
L2.773.4.71.2