The ETA 2340 watch movement is a manually-wound mechanical movement with a sub-second function. It features a bimetallic screw balance and shares similarities with the ETA 868, 870, and 874 movements, although the specific differences are not known. Additionally, the ETA 871 movement is a variation of the 865 with an indirect sweep second function. The ETA 2340 movement was produced around 1935.