Repair + Service: LeCoultre FutureMatic calibre 817

IMG_7319Ethan from Shanghai sent in this LeCoultre Futurematic. If you are a regular reader, you have seen one of these before on this blog.

The LeCoultre calibre 817 is one of the weirdest movements around. The auto winder and power reserve construction are over-engineered and also not very durable. LeCoultre used a non-automatic hooked mainspring, so in order not to break the mainspring, the winding weight is held to the side with a hook to prevent overwinding. Once the watch winds down a bit, the hook releases the winding weight again… Continue reading