The LANGE 31 is the world’s first mechanical wristwatch with a power reserve of 31 days and a patented constant-force escapement.
Type
Manual winding
Movement Type
Manual
Caliber
L034.1Jewels
62
Reserve
744
Frequency
21600
Hands
Small Seconds
Power Reserve
744h
Frequency
21600 A/h
Jewels
406
Case Back
sapphire glass case back
Shape
Round
Lug Distance
22mm
Material
18-carat white gold
Glass
Sapphire
Thickness
15.9mm
Diameter
45.9mm
Water Resistance
30m
Dial Color
Grey
Material
Alligator leather
Buckle
Deployant buckle
Color
Dark brown
Features
Outsize date, power-reserve indicator, constant-force escapement
