Seiko Alpinist Mechanical Watch Automatic SARB017Drive system: Mechanical automatic (with manual winding)Caliber No. 6R15Power reserve: 50 hoursNumber of stones: 23Second hand stop functionWith calendar (date) functionCase Material: Stainless steelCase diameter 39.5mmCase thickness: 12mmWindshield: Sapphire crystalLumibrite available (hands and indexes)Enhanced water resistance for everyday use (20 ATM)Magnetic resistanceSimple compass with adductor ringScrew-lock rotating crownScrew backsituation Currently working without any problemsCalendar operation no problemWatch comes with a second market nato canvas strap and I include original leather band (embossed calfskin) unusedWatch is from my personal collection and has hardly been used , crystal is clear with no scratches動作...良好傷・割れなど...なし