How to find Grand Seiko Caliber Numbers

How to Find Grand Seiko Caliber Numbers

How to find Grand Seiko Caliber Numbers

According to Grand Seiko:

The caliber number is a four-digit number that indicates the model of a movement (mechanical part of a watch). The Grand Seiko watch is mounted with an exclusive caliber. The mechanical caliber number starts with “9S”, the spring drive caliber number starts with “9R” and the quartz caliber number starts with “9F”.※Some quartz caliber number starts with “8J” or “4J”.

The four-digit model number on the case back is the caliber number.In the case of mechanical models, the attached “Grand Seiko Standard Inspection Certificate” is printed with “Caliber No.” So, the caliber number can also be checked on the certificate.

Source: Grand Seiko 9S caliber manual

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Hannah
Hannah
7 years ago

Hi, can you please tell me what the second set of numbers stands for if anything? Is that the serial number? Thank you

Terry Summers
Terry Summers
6 years ago

So is the caliber number simply a model number and does it have a any other significance as far as my warranty is concerned?

Terry Summers
Terry Summers
6 years ago

No problems, just wondered whether it was important or not. Thanks anyway. Terry

Mark
Mark
3 years ago

What does the “B5” in the box mean?

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