Autopen Signatures: How to Spot a Machine-Signed Autograph
What an autopen is, why autopen signatures aren't considered authentic autographs, and the visual clues that reveal a machine-signed autograph.
By the MAS Certified authentication team · Updated October 2026
An autopen is a machine that holds a real pen and reproduces a stored signature. It's commonly used by public figures and busy offices to sign large volumes of letters and photos. The ink is real, but the person didn't sign it — so to collectors, it isn't an authentic autograph.
Why autopen signatures are tricky
Because a real pen applies real ink, an autopen signature doesn't look printed. It can fool buyers who check only for 'real ink.' The giveaway is in how the line was made, not what it was made with.
The clues experts look for
A person signs with speed, changing pressure and tapered starts and finishes. A machine moves at a steady pace with even pressure, so its lines are uniform from start to end. Ink often blots slightly where the pen lands and lifts, and the line can show tiny, regular wobbles as the arm moves.
- Even line width from start to finish
- Small ink dots or blobs at the beginning and end of strokes
- A slow, steady 'drawn' quality with no natural flow
- Two signatures that line up almost perfectly when overlaid
Where autopens show up most
Fan-mail photos, letters, and items requested by mail are the most common sources. That doesn't make every mailed autograph an autopen, but it's a reason to have unwitnessed mail-in autographs reviewed.
Autopen checklist
- Uniform line thickness throughout
- Blunt, dotted starts and stops
- Identical match to another known example
- Came from a fan-mail or office request
- Signature on a letter with a printed salutation
Questions collectors ask
Is an autopen signature a real autograph?+
No. While real ink is used, the signer didn't personally sign it, so collectors and authenticators don't consider it an authentic hand-signed autograph.
Can an autopen signature be valuable?+
Some have historical interest, but they generally sell for a small fraction of hand-signed examples.
How can I tell for sure?+
Compare it against several known genuine examples and look for the machine clues above — or have MAS review it through Instant Verification.
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The full step-by-step method, witnessed vs. after-the-fact, and how to verify any COA.