How to Authenticate Autographs at Home: A Complete Guide

Most of the autographs that show up in my inbox are not forged on purpose. They are bought in good faith from sellers who are themselves wrong. That is not comfort — it just means a clean eye on a phone photo will save you most of the time, before any money moves. What follows is the order I work in when somebody sends me a JPEG and asks "is this real."

Start with the pen, not the name

Before I read who supposedly signed it, I look at the line. Ink flow tells you almost everything about whether a hand made the mark.

Real signing has a takeoff and a landing. The pen lands, deposits a slightly heavier dot of ink in the first millimeter, accelerates through the body of the letter, and lifts off with a tail that thins out. On a Sharpie Fine that tail is short. On a Pilot G2 1.0 it is more pronounced because the gel pen drags. On a Pentel Sign Pen black — the convention pen of choice for the last decade because it stays wet on glossy 8x10s — you get a fat first stroke and a tapered exit.

If the line width is exactly the same in the down-stroke as in the up-stroke, you are not looking at handwriting. That is either an autopen, a stamp, or a print.

One thing I tell people who are new to this: zoom in on the very first letter and the very last letter. The middle of a signature can be sloppy and still real. The entry and exit have to behave like a pen.

Substrate matters more than people think

What the signature is on changes what "real" looks like. A few that come up constantly:

• RC photo paper (the glossy 8x10 you get at conventions) does not absorb ink. Sharpie sits on top and dries slow. You will sometimes see a smear at the descender of a "g" or "y" because the actor's palm dragged through it. That smear is a good sign on a con-floor signing.
• Studio still / matte cardstock is what publicists hand out. It absorbs more, so the line bleeds slightly into the fiber. Sharpie on matte should show a tiny halo under a 10x loupe.
• Glossy poster stock is the worst surface to read. Ink beads up. People panic and call it a fake when it is just a wet pen on a slick surface.
• Index card — what the in-person grail-hunters carry — takes ink cleanly. If a signature on an index card looks like it was done at speed and there is a tiny ink pool at the entry, that is consistent with a stage-door grab.

Mismatch is the tell. A "1985 Harrison Ford" on photo paper that did not exist commercially until later in the decade is a problem. So is a Sharpie signature that bleeds the way a fountain pen would.

The four common impostors

Autopen

The machine traces a stored path with a real pen. The result is real ink. The tells: line width is constant from start to finish (because the machine cannot vary pressure the way fingers do), curves are too clean, and there is usually a small "wobble" at high-speed corners that no hand produces. The biggest gift autopens give us is repeatability — if you find two examples that overlay perfectly when scaled, neither was hand-signed. I keep a folder of the known Stallone, Reagan, and Buzz Aldrin autopen patterns and overlay-match against those first.

Stamps

Rubber stamps land flat. The ink sits on top of the surface, edges are hard, and there is no entry dot or exit taper. Stamps were huge in the 1960s/70s movie-studio fan-mail era. If a "1971 Charlton Heston" comes in with no pen variation, it is almost certainly a studio stamp.

Secretarial

This is the one that costs people money, because it is real ink applied by a real human — just the wrong human. The well-documented Sylvester Stallone secretarial era runs roughly 1996 through the early 2000s; pieces from that window need a second look even when the pen behavior is right. Secretarials tend to be too careful: the signer is drawing the boss's signature from memory, so you get hesitation marks — tiny pauses — in places where the actual signer rips through. I cannot tell you from a single photo whether something is secretarial. That is an in-person review.

Pre-prints

The signature is part of the print run. Run a fingernail across it. Real ink has physical presence; you can feel a Sharpie tail catch slightly. A pre-print is flush with the rest of the photo. Under a 10x loupe a pre-print breaks down into the CMYK dot pattern of the underlying image. There is no other test you need.

What I keep on my desk

You do not need a lab. The kit:

• A 10x jeweler's loupe. $15. Mine is a Belomo triplet because it does not distort at the edges, but a generic plastic one is fine for triage.
• A cheap UV flashlight. Older ink fluoresces differently than recent ink. A 1990 signature should not look like it was written yesterday.
• A phone with macro mode and good light. Daylight by a window beats any ring light.
• An exemplar folder. Pull verified examples off Heritage Auctions, Propstore, and PSA-authenticated eBay sales for whichever signers you collect. Save 8–10 per era. The era part is the part most people skip and it is the part that matters.

Comparing against exemplars without fooling yourself

People do this badly. They pull up one Google Image of "Tom Hanks autograph," see that the shape is sort of right, and call it. Three rules I keep:

1. Match the era. A signature from 1989 looks different than 2019. The "k" in Hanks tightened up over the years. The "T" got faster.
2. Match the substrate. Compare a Sharpie 8x10 to other Sharpie 8x10s, not to a Pilot G2 on cardstock.
3. Look at construction order, not silhouette. Where does the pen lift? Where does the next stroke start? Forgers copy the shape but get the order wrong.

Where I stop and the authenticator team takes over

Our working authenticator on staff handles the in-person review. Anything I cannot verify from a phone photo — substrate questions, suspected secretarials, anything in the Stallone window, anything over about $500 — goes to the authenticator team for in-person review. The process is the same one PSA/DNA, JSA, and Beckett use: hand on file, era check, substrate check, written opinion. The difference is turnaround and price; their work is encapsulated and worth the cost above a certain threshold.

Honest hedge: I cannot tell you from a JPEG whether the paper is original or whether the ink has aged correctly. If you need that level, send the piece in. Anything I say from a photo alone is a triage opinion, not an encapsulation.

Red flags that end the conversation for me

• The seller has nine different signed photos of nine different actors at $39 each. Nobody has that supply at that price.
• The COA is from a company nobody at PSA, JSA, or Beckett has ever heard of. A printed certificate is worth what it costs to print, which is nothing.
• The signature sits in the same spot on three different copies of the same poster. Hands do not place ink to the millimeter.
• The pen type did not exist when the actor would have signed. Sharpies in their current form are 1979 onward. Felt-tips are 1962. Anything earlier needs a fountain or a ballpoint.
• "Premiere signed" with a story instead of a date and a venue.

Most fakes are not subtle. They are bad pen behavior plus a bad story plus a price that does not work. Walk on those. Spend your money on the harder ones — the secretarial, the late-career style shift, the in-person grab from a stage door — and use a working authenticator when those come up.