Every year, more reproductions enter the market than genuine originals leave it. Knowing what separates the two is the single most useful skill a collector can develop, and it comes down to a handful of checks rather than guesswork.
Start with the printing method
Original posters from before the 1990s were almost always produced by stone or offset lithography, sometimes letterpress. Under a loupe, lithographic printing shows solid, flat fields of colour, occasionally with a fine rosette dot pattern from the printing plates. Modern reprints are usually digital or giclée prints, which show a much finer, regular dot matrix or an inkjet spray pattern, and the paper often has a bright white, coated, photographic feel that vintage stock never had.
Check the paper stock and ageing
Genuine age leaves genuine evidence. Original posters are printed on paper that has usually mellowed slightly, sometimes with light, even toning, and they were folded or rolled for distribution, which leaves real crease lines with actual wear in the fibre rather than a printed-on crease effect. A poster that claims to be sixty years old but has crisp white paper and no handling history at all is worth a second look.
Look for printer and distributor marks
US posters printed through National Screen Service carry an NSS number, usually bottom right, which ties the poster to a specific release year (see our guide to NSS numbers). British quads often carry a printer’s credit in the margin, from houses like Berry & Co, Lonsdale & Bartholomew or W.E. Berry. The absence of any of these marks isn’t automatically a red flag on its own, especially for European or Polish posters, but their presence and consistency with the claimed date is a strong positive signal.
Match the size to the format
Every country had standard poster sizes: the British quad measures 30 x 40 inches landscape, the US one sheet 27 x 40 inches portrait (27 x 41 inches on older examples), the Japanese B2 around 20 x 29 inches. A poster sold as an original quad that measures 24 x 36 inches is not a quad. Reprint publishers frequently use slightly different dimensions to the original release, so a tape measure catches problems a photograph never will.
Verify against a reference
Cross-check the poster against a known example from an auction archive (Heritage Auctions keeps searchable records of past sales) or the IVPDA member directory. If the artwork, colour separations, and NSS or printer details line up exactly with a documented original, that’s the strongest evidence available short of provenance paperwork.
Ask about provenance
A poster with a documented ownership history, particularly one that traces back to a studio archive, a theatre, or an earlier reputable dealer, carries real authentication value of its own. Always ask a seller where a poster came from. A vague answer is not disqualifying, but a specific, checkable one is worth paying a premium for.
When in doubt, buy from a specialist
The fastest way to avoid buying a reproduction is to buy from a dealer who authenticates every piece before it’s listed, ideally one who is a member of a recognised trade body such as the IVPDA. This shifts the burden of proof to someone with the expertise and the reputation on the line to get it right.
