Unitas 6310

The Unitas 6310, also known as the 'Wehrmachtswerk' (German Military Movement), is a vintage Swiss manual-wind caliber from the 63xx series. Early versions featured a fixed stud carrier, while later production moved to a mobile stud carrier design. The calibers 6310 through 6318 represent varying bridge shapes within the same basic architecture. This 13-ligne movement was widely used in 1950s military-style wristwatches and represents an important part of post-WWII watch production. The movement was produced by E. Marten and other manufacturers using Unitas ebauches.