The Junghans J47C/1 watch movement is often or always signed as Femga 500. There are significant similarities between the Femga 500, 502, 520 and Precimax 250, 250SC, 400, 450 watch movements, suggesting a possible relationship between the French Femga and the Swiss Precimax manufacturers. However, the exact nature of this relationship is not known. The Junghans J47C/1 movement features manual winding and sweep seconds functionality.