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|Case:||Stainless steel with ceramic bezel|
|Glass Material:||Sapphire crystal|
|Glass Coating:||Anti-reflective coating on inner surface|
|Case size:||Diameter 40 mm × Thickness 13,1 mm|
|Clasp type:||Three-fold clasp with push button release|
|Accuracy:||±10 seconds per year|
|Water resistance:||20 BAR / 200 M / 660 FT|
|Other details / Features:||Strap length 203mm, Lumibrite on hands and indexes, Reinforced magnetic resistance equipped, 24-hour hand (dual time display function), Calendar-linked time difference adjustment function, Date display, Screw-down crown.|
This quartz GMT creation combines form and function deliver the precision, durability and ease of use that are the hallmarks of Grand Seiko. The muscular steel case has a ceramic bezel whose hardness protects it from scratches and ensures its lasting beauty. The light blue of the GMT hand is mirrored in the dial ring to make it easy to read the 24 hour hand at a glance and the GMT hand is illuminated by a Lumibrite that emits a different color than that of the hour and minute hands and indexes, ensuring high legibility even in the dark. The twin pulse quartz caliber 9F86 delivers the high torque needed to keep the wide hands moving precisely and offers the wearer the convenience of being able to change the time zone without stopping the seconds hand.
"A MODEL FEATURING A DATE DISPLAY WITH GMT FUNCTION"
Offering the same functionality as the standard Caliber 9F82, Caliber 9F86 is equipped with the first GMT function of Grand Seiko.
Precision and simplicity form the very essence of the ideal timepiece, allowing it to fulfill a lifetime of commitment to its wearer. 9F was the first quartz movement to achieve this fundamental ideal.
The Instant Date Change Mechanism changes the date display in the blink of an eye.
Torque comparable to that of a mechanical movement makes the iconic wide hands of Grand Seiko possible.
Improved second hand precision achieves greater positional accuracy on the dial against the markers.
The sealed structure improves retention of lubricating oils.
Caliber 9F redefines the quartz watch, delivering higher performance and greater durability. It is the quartz watch that merits the name Grand Seiko.
A quartz movement depends on a battery as a power source. The battery sends electricity to a quartz oscillator, which vibrates at precisely 32,768 times per second. An integrated circuit (IC) detects these vibrations and sends out an accurate time signal every second to the step motor. The step motor activates in accordance with this time signal, accurately rotating a series of gears and the watch hands.