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Longines serial number checker

Estimate production from Longines' published sequential records through serial 15,000,000.

Returns a yearPrivate browser check
Check your serial number
Spaces, dots, and dashes are fine. The check runs in your browser; the value you enter is not submitted to us.

Example: 9521000

Reference only—not an authenticity verdict
A plausible date code can appear on a counterfeit, and an unusual or unreadable code does not by itself make an item counterfeit. Use the result as one clue alongside construction, materials, provenance, and expert review.