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Editorial note

This guide is for reference only. Watch markings can be reproduced, altered, or vary between production runs. For authentication or valuation, consult a qualified watchmaker or authorized dealer.

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An independent reference for identifying watch markings, serial numbers, and case-back codes. Not affiliated with any manufacturer.

Brands

Seiko
Citizen
Tissot
Hamilton
Casio
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Mark Library

Case Back Marks
Bracelet Marks
Case Marks
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Resources

Water Resistance
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AI Watch Check

This site is for reference only. Markings can be reproduced or altered. For authentication, consult a qualified watchmaker.

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