Lange L931

Description:

• Hand-winding form movement
• Big date, small seconds with hacking seconds
• Glucydur screw balance, Nivarox balance spring with swan's neck fine regulation
• Beat adjustment via micrometer screw for index adjustment
• Glashütte three-quarter plate, bridges with Glashütte stripes

Functions:

• Hours, minutes, small seconds at 6 h
• Hacking seconds
• Big date at 12 h
• Corrector for date display at the side of the case

Data:

• 21,600 A/h
• 30 jewels, including 3 in screwed gold chatons
• Power reserve 42 hours

Data:

• 31 jewels
• Big date, small seconds, moon phase
• 268 components
• Power reserve 42 hours