Gruen Genève manual-wind dress watch. Gruen is a historic American watchmaking brand that produced its high-end, luxury lines in Switzerland, marked by the Genève signature below the logo. It runs on Gruen Caliber 452SS mechanical watch movement. While many Gruen 452SS variants were standard 17-jewel configurations, this one is a higher-grade, more premium 21-jewel version, offering extra ruby bearings to decrease friction and improve the longevity of the gear train pivots.