Designed with a high intensity titanium case and bracelet, this 46.4mm Grand Seiko Caliber 9R86 Spring Drive Chronograph may well be the most accurate luxury chronograph in the world, offering a precision of one second a day or, fifteen seconds a month. Spring Drive, a unique Seiko movement that requires neither a battery nor an electric motor, makes it a completely self-contained system. Its power is derived from a mainspring, just like a mechanical watch, and its accuracy is controlled by the precise signal of a quartz oscillator. The black dial is supremely easy to read, thanks to the diamond-cut hands and markers, extended GMT and minute hands and the Lumibrite inserts on the hands as well as the markers. The watch is also a delight to wear, primarily because of the light-weight hybrid titanium-ceramic case and bracelet. As the zirconia ceramic parts are raised slightly above the level of the titanium, the bracelet is virtually impervious to scratches and will retain its pristine appearance just as long as the watch case itself. Remarkably, given the technical difficulty of polishing ceramics, the ceramic parts in the center of the bracelet are polished to a mirror finish and the signature Grand Seiko sharpness of the angles on each component has been achieved. Featuring a see-through caseback, Spring Drive movement allows for self and automatic winding capabilities and features 50 jewels, with accuracy +/- 1 second per day with over 72 hours power reserve. 10 bar water resistant. Men’s Grand Seiko Mechanical Hi-Beat 36000 GMT 46.9mm high intensity titanitum case and bracelet with black dial.