A. Lange & Sohne Richard Lange Tourbillon Pour le Mérite Platinum 760.025

A. Lange & Sohne
Serise:A. Lange & Sohne Richard Lange
Model:760.025
Case:
Case Material:Platinum
Case Glass:Sapphire
Case Back:Open
Case Diameter:41.90 mm
Case Height:12.20 mm
Case Lug Width:22.00 mm
Dial:
Dial Color:Rhodium
Dial Indexes:Roman Numerals
Dial Hands:Alpha
Movement:
With a fus¨¦e-and-chain transmission and a one-minute tourbillon, the L072.1 as found in the Richard Lange Tourbillon ¡°Pour le M¨¦rite¡± incorporates two of the most effective complications that increase rate accuracy. Its third complication is the patented stop-seconds mechanism. Thanks to this device, the tourbillon ¨C and with it the entire movement ¨C can be stopped and restarted to one-second accuracy.

Apertures in the three-quarter plate expose the fus¨¦e-and-chain transmission, which is so complex that it is rarely implemented in wristwatches. The owner can observe how the intricate 636-part chain unwinds from the mainspring barrel onto the fus¨¦e while the watch is being wound. The fus¨¦e-and-chain transmission is one of the most effective complications when it comes to increasing the rate accuracy of a mechanical watch. It is one of the tenets of physics that the power generated by a spring is high when it is fully tensioned and significantly weaker as it nears the fully unwound state. This can cause rate-accuracy fluctuations. The fus¨¦e-and-chain transmission works like an infinitely variable gearbox. It equalises the waning force of the gradually relaxing mainspring and makes sure that the movement always receives a constant amount of energy.
Type:Handwound
Brand:A. Lange & Söhne
Caliber:L072.1
Display:Analog
Diameter:33.60 mm
Jewels:32
Reserve:36 h
Frequency:21600 bph
Time:Hours, Minutes, Small Seconds
Additionals:Chain & Fusée, Tourbillon Escapement