Seiko Watch SRPJ47K1

The 4R36 Seiko caliber with day/date display is a mechanical caliber. The watch automatically charges itself when worn by converting the wearer's arm and wrist movements into energy. Movement of the watch causes the mainspring of the watch to be wound. This spring is the energy source. Hand winding is also possible. When the watch is fully charged, it has an energy reserve of approximately 41 hours. The tick number of this machine is 21,600 per hour and the watch has 24 jewels. The 4R caliber is manufactured entirely in-house.