The six value drivers
In roughly the order dealers weight them:
- Who signed it, and whether they are still signing
- Scarcity of that signature on that type of item
- Condition of both the signature and the item
- Provenance and accompanying documentation
- Presentation and framing quality
- Current demand for the name, which moves with anniversaries and media
Why prices vary so widely online
Asking prices are not sale prices. A marketplace listing at £1,200 that has sat unsold for a year tells you nothing. Realised auction results and dealer sale prices are far better evidence, and both sit well below insurance replacement values.
Three different numbers
Retail replacement value is what you would pay to buy the piece again. Fair market value is what it would realistically fetch between willing parties. A trade offer sits below both, because a dealer carries the cost of authentication, framing, display and the risk of holding stock. All three are legitimate; confusion between them causes most disappointment.
Researching a figure yourself
Search completed auction results for the same signatory on the same format, discount asking prices entirely, and allow for condition and presentation. For a formal figure, a qualified independent valuer is the right route.
Need a straight answer on a specific piece?
Send photographs and we'll give you an honest opinion — whether you're buying, selling or simply curious. You can also visit us at 87 Princes Street, Southend-on-Sea, Tuesday to Saturday, 10am–4pm.