What is an autopen, and how do I identify one?

An autopen is a machine that holds an ordinary pen and traces a signature from a template, known as a matrix. The ink is real ink and it sits on the surface exactly as a hand-signed mark does, which is why every check that catches a printed signature — raking light, magnification, indentation on the reverse — passes without difficulty. What gives an autopen away is not the ink. It is the geometry: a machine has no tremor, does not vary its speed, and draws the same path every time it runs.

Who uses one, and why it matters to you

Autopens are office equipment. Presidents and politicians have used them for constituent mail since the 1940s, and astronauts, executives, authors and studio publicity departments have used them to answer volumes of correspondence no human hand could keep up with. Nobody involved was committing fraud — the machine was answering the post.

The fraud happens later, when a piece signed by a machine is sold as one signed by a person. Because the ink is genuine, an autopen signature can look better than a real one: cleaner, steadier, more like the version of the signature you have seen reproduced. That is precisely what should make you suspicious.

The tells

No single one of these is conclusive on its own. Two or three together are a strong signal:

• Unvarying line weight. The stroke holds the same width and darkness from the first letter to the last. A hand accelerates, slows, presses and lifts, so a genuine line tapers and thickens constantly.
• Blunt starts and stops with pooled ink. The machine lowers a stationary pen onto the paper and lifts it the same way, so ink collects into a small blob at each end instead of trailing into a tapered entry or exit stroke.
• A fine tremor in the wrong places. Machine drive produces a slight regular wobble along what should be the smooth, fast parts of the signature — long straight strokes and wide curves — while a hand’s own tremor shows up at pauses and direction changes.
• Pen lifts in identical positions. The gaps between letters fall in the same places every time, and occasionally a faint doubled line appears where the arm retraced part of its path.
• Mechanically even spacing and slant. Letter spacing, baseline and slope stay uniform across the whole signature. Real handwriting drifts off its baseline and crowds toward the end.
• Ink that does not thin out. A real pen running low or moving fast produces skips and dry patches. A matrix traced slowly and evenly does not.

The overlay test, which is the one that settles it

An autopen reproduces its matrix exactly, and that is the flaw you can exploit. Find a second example of the same signature — another piece from the same period, an image in a reference book, another lot in the same sale — and compare the two at identical scale.

Photograph or scan both straight on, size them so a fixed feature such as the height of the capital letter matches, then overlay one on the other on a screen or a lightbox. Two genuine signatures by the same person will be similar and will never superimpose; loops land differently, the baseline shifts, the ending stroke runs longer or shorter. Two signatures from the same matrix line up stroke for stroke, including where the pen lifted.

If a signature you are considering matches another one perfectly, you are not looking at two signatures. You are looking at one, run twice.

Known matrices have been catalogued

Because a machine repeats itself, the patterns can be recorded — and for heavily autopenned signers, particularly American presidents and astronauts, collectors have spent decades documenting individual matrices and the dates each was in service. A specialist can sometimes tell you not merely that a signature is mechanical but which machine pattern produced it.

This is also why the date matters. A signature attributed to a period before that signer’s office had an autopen, or after a known matrix was retired, is a question worth asking on its own.

What an autopen is not

Three different things get confused here, and the remedies differ. A printed signature is part of the image, has no relief, and breaks up into dots under a loupe. A rubber stamp lays down flat, uniform stamp-pad ink with soft edges and often a visible plate edge, with no variation in pressure anywhere. A secretarial signature is fully handwritten, by an assistant, and therefore varies naturally the way any handwriting does — which makes it the hardest of the three to spot and the reason category knowledge matters.

The classic example in the trade is Clint Eastwood, whose secretary signed for him for years; the dealers selling those pieces were not forging anything and did not know. It took someone asking Eastwood directly, then learning to recognise her hand, before the market could tell the difference.

How can I tell if a signature is printed? →

When to get an opinion

Mechanical signatures are the situation in which an item can look flawless and still be worth almost nothing, and it is exactly where a comparison against real reference material earns its fee. If a piece is valuable, or if the signature strikes you as unusually clean, put it in front of somebody who examines this material for a living before money moves.

Piece of the Past examines entertainment memorabilia in-house, led by a CEO who wrote the “Fakes, Frauds and Forgeries” column for Autograph Collector, and answers questions on specific pieces including ones you already own. A clear set of photographs is usually enough for a first read.