The New Factory Tavennes 304 is a manual wind watch movement with a sub second function. It features a bimetallic screw balance and a stem mechanism without a setting-lever spring. The bridge shapes of this movement may differ from the ones shown in the Ebel 8.75''' movement. There are also differences that are not known between the New Factory Tavennes 304 and other Felsa movements such as the 158, 159, 185, 208, 212, 220, 238, 246, 251, 259, and 277. The New Factory Tavennes 304 movement was commonly used around 1925.