Seiko Watch SRPD51K1

The 4R36 Seiko calibre with day/date display is a mechanical calibre. The watch recharges itself automatically during wear by converting the wearer's arm and wrist movements into energy. Movement of the watch causes the mainspring of the watch to be wound up. This spring is the energy source. Hand winding is also possible. When fully charged, the watch has a power reserve of approximately 41 hours. The tick rate of this automatic is 21,600 per hour and the watch has 24 jewels. The 4R calibre is completely manufactured in-house.