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42 43 G.P.M.H. All movements powering the Classic Racing collection are chronometer-certified by the COSC (Swiss Official Chronometer Testing Institute). G.P.M.H. Chrono Ref. 168570-3001 Material Stainless steel and titanium Ø 44.50 mm Movement Self-winding Certification Chronometer certificate (COSC) Power reserve 46 hours Frequency 28,800 vibrations per hour (4 Hz) G.P.M.H. Chrono Ref. 158570-30