Spring driven with lever escapement, shock protection device (Incabloc pandan, but of German production), antimagnetic. Self-winding. Caliber FB 221 (Dugena 2311).
Caliber Dugena 2311 is derived from the caliber 2301; it is self-winding and has digital time display. The company Bernhard Förster GmbH, Pforzheim was founded in 1907. Initially produced clasps and similar parts for jewelry. Since 1934 it manufactured watch movements and watches under the name Förest. From 1974 onwards the profile of the company changed because of cheap movements from the Far East, and presently the company manufactures orthodontic appliances.