Identify the exact watch
Record the reference, approximate production period, movement, case and bracelet material, dial, bezel and size. Similar names can conceal different generations and specifications. Confirm whether any parts are original, replaced or aftermarket and ask the seller to put the answer in writing.
Read condition as a repair question
Request sharp photographs in daylight and a written condition report. Look for case polishing, sharpness of edges, bracelet stretch, clasp wear, dial condition, moisture marks and correct operation of crown and complications. A polished case is not automatically bad, but undisclosed work can affect originality and resale.
Check the service trail
Ask for dated invoices from a recognised service provider, parts replaced, pressure-test results if relevant and warranty status. A box of documents is useful only if it refers to the watch being sold. Budget for service if records are absent; do not treat a seller's timing claim as a mechanical inspection.
Protect the transaction
Use a specialist with a documented authentication and return policy. Confirm insured shipping, import responsibilities and service availability in your home market. Have the watch inspected promptly within the return window and retain all records. A popular reference is not automatically a sound purchase at any price.