Instruction

Seiko will gradually discontinue attaching paper instruction manuals to its products as part of a paperless operation starting February 2024.

Check the case back of your watch to find the caliber code inscribed on it, and read the instructions pertaining to your watch caliber code.

How to find the Caliber Code

On the Case Back

In the Certificate of Guarantee

Select Your Language

Select from the caliber code

Click the first digit of the caliber code

Caliber Code	Instruction
5
5X53	Instruction of 5X53 (GPS Solar) Complete User Guide for Astron : English
5X53	Handy Manual of 5X53 (GPS Solar) for Astron : English