Identify the exact item
Determine the signer, object, edition or model, inscription, likely signing period and whether any separate use or provenance claim is being made.
Authentication and provenance
Third-party authentication is an expert opinion. Witnessed certification, manufacturer certification and post-signing examination describe different evidence. Preserve receipts, event records and item-specific photographs.
Value comparisons
Match signer, item type, authentication company, inscription, condition and historical context. A signed common photograph, game-used object and handwritten letter occupy different markets.
Five marketplace views
Buyer rule: A famous name in a listing title is not evidence that the person signed the item.