Grand seiko watch mechanical this grand seiko watch comes with one very intriguing characteristic mechanical automatic calibre this means that the timepiece has hand winding capability the calibre is 9s65 and it performs 28 800 vibrations per hour a 72 hour power reserve is available the movement is protected from water penetration and magnetic influences a date window is positioned conveniently at the 3 o clock mark hands mark hours minutes and seconds additional functionalities inclu