Autographs 101 · Collector guide
How do you check whether a signature is consistent with known examples?
Free signature consistency checklist
Eight questions. No signup, nothing uploaded. The interactive version requires JavaScript; without it, answer each line yes, no or can’t tell in your own notes.
- I compared it with several published examples from the same era
- Letter shapes and capital-to-lowercase proportions look similar to those examples
- The line looks fluid, without retracing, blunt starts or hesitation marks
- Under magnification the ink looks hand-applied, not a dot pattern or flat print
- I found no identical copy of this exact signature (a sign of a stamp or machine)
- Placement and pen type fit how this signer usually signs this kind of item
- Any certificate number checks out on the issuer’s own lookup and matches this item
- I know where the item came from (event, seller, receipt or photo)
This checklist organizes your own observations. It is not authentication, not an opinion on who signed the item, and not a certificate. For anything you plan to buy, sell or insure, ask a qualified third-party authenticator.
Gather examples from the same period
Signatures change over a career. Collect several examples from roughly the same years as your item, ideally from sources that document how they were obtained, such as certified examples in an authenticator's lookup or items signed at a documented public signing.
Keep each example's source and date next to it. One example is a starting point, not a standard: people sign differently on a ball, a photo and a card, and a rushed signature at a stadium can look different from a seated signing.
Compare letter forms, proportions and flow
Look at the first letter of each name, the height of capitals compared with lowercase letters, any loops, and how the signature ends. Note whether the line looks fluid or slow and deliberate; hesitation, blunt starts and stops, and retracing are details worth writing down.
Record differences without deciding what they mean. A difference can come from age, surface, speed or pen, and an apparent match does not settle anything on its own.
Check the ink, surface and placement
Note the pen type, ink color and how the ink sits on the surface. Look for even, dot-like patterns under magnification, which can indicate printing, and for identical copies of the same signature, which can indicate a stamp or machine.
Placement matters too: compare where the signer usually signs that kind of item, and whether the signature crosses features in a way that makes sense for how the item was produced.
Review the records separately from the signature
Write down every record that came with the item: certificate number, hologram, seller, receipt, event and date. Check each certificate with its issuer's own lookup and confirm the record describes this exact item.
A strong signature comparison does not replace missing records, and a certificate does not replace a careful look at the item. Keep the two questions apart in your notes.
Decide on your next step
If your notes show open questions, consider a qualified third-party authenticator before buying, selling or insuring the item. For a lower-value piece, compare the cost of authentication with what the item is worth to you.
An Autographs 101 Pre-Screen can add an AI comparison to your notes. It is an informational opinion, not authentication, and it does not replace an authenticator's review.