Assessing a pre-owned watch: cross-check condition and documentation

Surface scratches are only one part of a pre-owned assessment. Provenance, component condition, functions and service history should support one another. Photographs cannot replace reliable professional assessment of major authenticity or material questions.

Match identity and records

Record the reference, version information, accompanying documents and service history. A serial number, box or card is a clue, not complete proof. Establish the scope of replacement, refinishing or repairs instead of treating documentation as evidence of an untouched watch.

Assess the complete exterior

Inspect lugs, case edges, crystal, back and attachments, including wear that affects load-bearing parts. A fresh appearance does not prove movement condition and may follow cosmetic work. Normal use marks do not automatically imply an immediate overhaul either.

Check function under suitable conditions

Winding, setting, calendar and complications must be checked within their operating restrictions. Rate, reserve and water resistance benefit from appropriate observations or tests. Define the work and results when using a service provider rather than calling one brief inspection comprehensive authentication.

Common misunderstandings

Weight, sound, a crystal experiment or one detail cannot establish the entire watch's authenticity. Some shortcuts may also cause damage. Keep confirmed and unconfirmed information clearly separate.

Your practical checklist

• Cross-check provenance, version and service history.
• Separate cosmetic condition from mechanical condition.
• Use qualified assessment for consequential uncertainties.