The Jaeger Lecoultre 807 is a mechanical watch movement with a bimetallic screw balance. Its identification is uncertain due to the absence of a setting-lever spring, although some other AS calibres exist with and without this spring. The differences between the 612, 632, 664, 669, and 687 are not known. The movement features manual winding, a sub-second function, and it was produced approximately around 1925.