Spotting a fake collector banknote

Banknotes · 6 September 2026

What turns up in collections is rarely a serious forgery. It is usually one of three things: a modern souvenir reproduction, a genuine note that has been altered, or a common note sold as a scarcer variety. All three are caught by the same four checks – how the paper feels, how the printing sits, what appears in transmitted light, and how the small details hold up – and none of them needs equipment.

Check one: the paper

Banknote paper is not ordinary paper. It is made from long-fibre stock, it has a distinct stiffness and a slightly rough, dry feel, and it does not fluoresce brightly under UV the way office paper does. Reproductions are usually printed on coated or ordinary paper: smoother, floppier, sometimes glossy. A note printed on paper that feels like a magazine page has already answered the question.

Check two: the printing

Genuine notes of the classic era were printed by intaglio – ink sits raised above the surface, and running a fingernail lightly across the portrait or the lettering gives a faint ridged feel. Under a magnifier the lines are crisp and continuous, with fine cross-hatching in the shading. A reproduction printed by offset or inkjet is flat to the touch, and under magnification the shading breaks into a grid of identical dots. This is the same test used for paper items generally, described in the guide to telling an original from a copy.

Check three: the watermark

Hold the note up to the light. A real watermark is created by varying the density of the paper, so it appears only in transmitted light and has soft, graded edges. A printed imitation is visible in reflected light too – lay the note on a table and look at it from above: if you can still see the "watermark", it is printed. The full method is in the guide to seeing a watermark.

Check four: the small detail

• Lettering. Compare the typeface, spacing and the shape of individual letters against a reference image. Reproductions drift here first.
• Serial numbers. On genuine notes the digits are evenly spaced and consistently formed. Wrong font, uneven baseline or a number that does not match the known series pattern is a warning.
• Fine background lines. The guilloche patterns are continuous and never blurred. Softness or breaks mean a copy of a copy.
• Size. Measure it. Reproductions are frequently a few millimetres off, because they were scaled to fit a printer rather than to match the original.

The other two problems

1. Altered genuine notes. A real note with a changed date, added overprint or repaired serial number. Look for differences in ink tone and sheen between the altered element and the rest, and for paper disturbance under the light.
2. Honest reproductions sold dishonestly. Museum and publisher facsimiles were often marked as copies on the back or in the margin – and those marks get trimmed off. An undersized note with suspiciously clean edges deserves a size check.
3. Common notes described as rare varieties. Not a fake at all: the note is genuine and the description is wrong. This is settled by identification, not by physical checks.

The habit that settles most cases

Compare against a reference image before anything else. The open archive holds 635 Soviet banknotes, 462 of them dated, most shown from both sides, including the series of 1961 and 1991 with their watermarks photographed separately. Put your note beside the archive image at the same scale and look at lettering, guilloche and proportions. Differences that are invisible in isolation are obvious side by side.

Open the sections: coins and banknotes, stamps.

What not to do

• Do not test with solvents, bleach or heat: destructive, and inconclusive.
• Do not wash or press a suspected note – it removes evidence either way.
• Do not rely on a single check. Any one of the four can mislead; together they rarely do.
• Do not pass on a note you believe is a reproduction without saying so. Keeping copies is fine; describing them accurately is the whole point.