The Fontainemelon 276 watch movement was in use from 1928 onwards. Its frequency is listed as either 18,000 or 20,160 A/h, although Gruen catalogs do not provide a clear clarification on this matter. Key features of this movement include a bimetallic screw balance and a Breguet hairspring. The signature often or always found on this movement is "Gruen 106." It is uncertain if there are any notable differences between the 1067 and 1077 variations, as the available information does not provide details regarding these discrepancies. It is suggested that these variations may have denoted different base-plate shapes, such as round corners or octagonal. The Fontainemelon 276 movement is manually wound.