Some watches have identifying marks in a place that is not visible while the bracelet is attached. Removing a bracelet can scratch the case or damage a spring bar if you lack the right tools and experience.
Ask the seller to arrange access
A seller or qualified watchmaker can often expose the area safely. Agree that the watch will remain in view and that the serial will be recorded accurately. Do not accept a number read from memory when the actual engraving can be checked.
Compare the engraving with paperwork
Look for agreement with service documents or manufacturer records that clearly refer to the same piece. Record any characters that are hard to read as uncertain instead of guessing.
Keep an inspection trail
Note who inspected the watch, when, and whether the bracelet was reinstalled. If the watch is part of a purchase, include the serial in the invoice and retain a photograph where appropriate.
Once verified, you can use the serial for a status search. A no-match remains limited to the records and time of that search.
Verify Before Searching
Get a clear serial from a safe inspection instead of risking damage to the watch.