Back to 9S Mechanical


$ 3,834


Driving systemMechanical Automatic (Hand winding capability)
Caliber No.9S66
CaseStainless steel Case back: Stainless steel and sapphire crystal
GlassBox-shaped sapphire crystal
CoatingAnti-reflection coating on inner surface
Accuracy+5 to -3 secnds per day (when static); This accuracy is the result of measuring the loss/gain of the time for seventeen days before the inside movements of the watch are put in the case. The measurement has been done in the factory where temperatures or position of the movements are controlled. When the watch is actually worn, the accuracy should be from -1 second/day to +10 seconds/day (-1 second/day to +8 seconds/day for Cal.9S85, 9S86).
Water resistance3 bar
Magnetic resistance4800 A/m (60 gauss)
Weight88.0 g
Case sizeDiameter 39.5 mm x Thickness 13.7 mm
Remarks・See-through back
・Jewels: 35
・Dual time function with 24-hour display
・Quick correction function of time difference adjusting to a calender
・Power reserve: Over 72 hours


“Our goal was to create the best possible mechanical watch for everyday use.”

This was the vision. Caliber 9S inherits the spirit of the first Grand Seiko from 1960; a timepiece crafted to the same exacting standards as the very best chronometers of its time.
Incorporating both the very latest in watchmaking technology and the finest craftsmanship, Caliber 9S offers high precision and reliability that endures.

The accuracy of a mechanical watch depends greatly on the precision of its hundreds of individual parts. This is why all the components of each Grand Seiko watch are made by Seiko in-house and to the same high standards. To ensure the very highest levels of precision, certain key parts are made using Micro-Electro-Mechanical Systems (‘MEMS’), a cutting-edge manufacturing technology originally developed for semiconductors.

It takes more than a collection of precision parts to make a masterpiece. To reach the strict accuracy standards of Grand Seiko, key parts are individually polished and fine-tuned with great care by elite craftsmen and women to an accuracy of 1/1,000th of a millimeter before being assembled into a complete timepiece.

Seiko is proud of being a true manufacture for over a century. Grand Seiko’s Caliber 9S is the pinnacle of Seiko’s watchmaking today, offering the very best watches for everyday use. The vision is now a reality.

Additional information

Weight1 kg
Dimensions4 × 4 × 2 cm


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