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BALL Chronometer Manufacture Caliber RRM7309-CS Swiss made mechanical movement Anti-magnetic silicon balance spring Dimensions: Ø 34.24mm, height 5.16mm Functions: Hours, minutes, sweep seconds and date Winding: Automatic Vibrations: 28,800vph, 4Hz Power reserve: 80 hours Anti-magnetism: 2,500G / 200,000A/m Jewels: 25