The Cortebert 681 watch movement is an open face calibre with a height listed between 5.0 and 5.05mm in catalogs. It can be identified after the balance-staff dimensions. Not much is known about the differences between the 247 and 249 models. The movement features stem winding and setting, as well as a sub second function. It was commonly used around 1925.
The Cortebert 681 features the following functions: