With its screw-down crown, distinctive hands generously coated with Lumibrite, one-way rotating bezel and water resistant to a depth of 200 meters, this watch provides all the security and legibility that the diver requires. It also offers the precision and durability of Grand Seiko's divers'
high-beat movement, Caliber 9S85.
Each hand is different, to ensure that the time can be read easily and without error that they stand out clearly from the dark blue dial. The triangular marker at twelve o’clock ensures that, even at depth, no mistake is made.
Every component is built to last, but all divers know that their watch needs regular maintenance, just like every other device on which his or her life may depend. This is why the case, stem pipe and crown are designed for secure servicing and even the bezel has a four-part design that makes for
easy disassembly and re-assembly at the Grand Seiko Service Centers.
Back cover: screw back cover
Glass material: sapphire
Coating: Inner non-reflective coating
Lumibrite: Available (needle, index, bezel)
Case size: Width 43.8mm Length 51.0mm Thickness 14.7mm
Clasp: One push diver adjuster method
Arm circumference length (longest): 190mm
Driving method: Mechanical automatic winding (with manual winding)
Drive period: Lasts about 55 hours at maximum winding
Accuracy: Average daily difference +5 seconds to -3 seconds
Antimagnetic: can be
Other: ・Number of stones: 37 ・Reverse rotating bezel ・Screw lock type crown ・Double lock clasp