The Omega 300 is a mechanical watch movement with manual winding and sub-second functions. It features a bimetallic screw balance and a stem mechanism without a setting-lever spring. The bridge shapes may vary from the Ebel 8.75''' model. Variations exist between the Omega 300 and other movements such as the 158, 159, 185, 208, 212, 238, 246, 251, 259, 261, and 277, although specific differences are not known. It was commonly used around 1925.