Seiko in-house caliber 9S66 found in a Grand Seiko GMT Limited Edition. This caliber is essentially an upgrade from GS cal. 9S56 which offered a lower 48 hr power reserve.
Grand Seiko
Seiko caliber 8R28 found in an Ananta model SRQ011. This automatic chronograph movement has 34 jewels, power reserve of 45+ hours, consists of 292 parts, and beats at 28,800 vph. It has a column wheel and vertical clutch. Made in Japan.
Seiko caliber 9R86 found in the Grand Seiko Spring Drive model SBGC005. 50 jewels and consisting of 416 parts. Made in Japan.
Manufacturer Grand Seiko Caliber Number 9F62, 9F62A In-House? Yes Accuracy Rating +/-10 seconds per year Battery Number 371 / 370...
Brand Seiko Caliber Number 9S65 / 9S65A Movement Type Automatic Jewels 35 Power Reserve 72 hours Vibrations Per Hour 28,800...
Manufacturer Grand Seiko Caliber Number 9S85 / 9S85A Movement Type Automatic (Hi-Beat), self-winding mechanical In-House? Yes Jewels 37 Power Reserve...
What is the difference between Seiko caliber NH25 and NH35? There are some differences between these overall similar movements. The...
According to Grand Seiko: The caliber number is a four-digit number that indicates the model of a movement (mechanical part...
Brand Seiko Caliber Number 5740C Base Caliber 5740 Movement Type Manual wind, mechanical Jewels 23 Vibrations Per Hour 36,000 bph...
Vintage Grand Seiko quartz powered watch movement. Full caliber listing coming soon. Comment below if you have experience with this...
Grand Seiko caliber 9S86 automatic luxury watch movement. For now, please check 9S85. Full caliber listing coming soon....
Manufacturer Seiko Caliber Number 8L55, 8L55A Movement Type Automatic In-House? Yes Diameter (needs confirmed) Casing Diameter (needs confirmed) Height (needs...
Manufacturer Grand Seiko Caliber Number T-Zero (T0) Movement Type Tourbillon, manual-wind In-House? Yes Diameter 36mm Thickness 8.22mm (total) Jewels 43...
Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R65, 9R65A Movement Type Automatic, Spring Drive In-House? Yes Jewels 30 Frequency...
Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R31, 9R31A Movement Type Spring Drive, manual-wind In-House? Yes Jewels 30 Frequency...
Below is a list of Seiko movements. The Seiko calibers that are already listed on the site will be linked...
Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9SC5 Movement Type Automatic, self-winding mechanical, chronograph In-House? Yes Jewels 60 Beat...
This video shows a tour of the Grand Seiko Studio Shizukuishi. Presented by Masayuki Hirota, Editor-in-Chief of Chronos Magazine Japan...
Brand Credor (Seiko Watch Corporation) Caliber Number 7R31, 7R31A In-House? Yes Movement Type Spring Drive, manual-wind Diameter Unconfirmed Height Unconfirmed...
Manufacturer Grand Seiko (Seiko Time Corp.) Caliber Number 9F85, 9F85A In-House? Yes Movement Type Quartz, battery-powered Chronometer Spec? Yes Thermocompensated?...
Manufacturer Grand Seiko Caliber Number 9S64, 9S64A In-House? Yes Movement Type Mechanical, manual-wind Jewel Count 24 Beat Rate 28,800 vph,...
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Exactly true.
A new guide is being written and will be published soon. Some caliber listings will…