The 6R35 Seiko caliber with 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. Manual winding of the timepiece is also possible. When the watch is fully charged, the watch has a power reserve of no less than 70 hours. The tick number of this automatic is 21,600 per hour and the watch has 24 jewels. The 6R caliber is completely manufactured in Seiko's factory.