'Pour le Mérite' movement, indicating it is one of the most intricate and precise movements by A. Lange & Sohne.
As modest and straightforward as this watch may seem, its movement is highly complex and consists of 915 individual components. The filigreed chain is composed of 636 parts. In crafting the transmission chain, the 636 parts are transformed into 212 links, which are joined to form a chain with a length of 152 millimetres. It is of paramount importance to assure that all links have ample freedom of movement so that the chain can be precisely wound and unwound.
A drop-shaped cutout in the three-quarter plate reveals the high-precision fusée-and-chain transmission, which is rarely implemented in wristwatches. It allows the owner to observe how the intricate chain unwinds from the mainspring barrel onto the fusée while the watch is being wound.