If you’ve handled a vintage US movie poster, you’ve probably noticed a small number tucked into a bottom corner, something like 77/21 or 75/155. This is an NSS number, and once you understand it, it becomes one of the most useful authentication and dating tools available to a collector.
What NSS stood for
The National Screen Service was the company that dominated the printing and distribution of American movie posters and advertising accessories for most of the twentieth century. It began by handling movie trailers in the late 1920s, then signed its first poster distribution deal with Paramount in 1939. RKO followed in 1940, Loew’s in 1942, Universal in 1944, Columbia in 1945, United Artists and Warner Bros in 1946, and 20th Century Fox in 1947. By the second half of the century, NSS controlled around 85 percent of major studio poster distribution in the US.
How the numbering system worked
From 1942 onward, NSS assigned each film a stock number in the format YY/NNNN. The first two digits gave the year, and the number after the slash was the film’s sequential position among that year’s releases. Star Wars carries the number 77/21, meaning it was the twenty-first film NSS assigned a number to in 1977. Jaws is 75/155, the 155th film of 1975. These were inventory codes for NSS’s own warehouse system, not limited-edition print numbers, so a poster numbered 75/155 does not mean only 155 copies were printed.
The “R” prefix
If a poster was produced for a re-release rather than the film’s original cinema run, NSS prefixed the number with an “R”. R62/198, for example, denotes the 1962 re-release of a film originally issued earlier. This single letter is often the fastest way to distinguish a first printing from a reissue.
Where to find the number
NSS numbers usually appear printed in the lower corner of the poster itself, and were also frequently rubber-stamped on the reverse. That reverse stamp, applied with strong ink, can occasionally bleed through very slightly to the front. This is not a flaw. If anything, it’s a useful, positive sign of authenticity.
When the system changed and ended
For much of its run the format used a two-number year and a slash. Around 1977 the format was modified, and by the mid-1980s the cinema landscape had shifted decisively, with multiplexes consolidating poster sizes down mainly to the one sheet and studios gradually taking distribution back in-house. NSS was bought by Technicolor in 2000 and closed in 2007, so films released after around 2000 carry no NSS number at all.
Using NSS numbers to date and authenticate
Because the number ties a poster directly to a specific year and release slot, it’s one of the fastest cross-checks against a film’s known release history. If the NSS number doesn’t correspond to any documented release window for that title, that’s a strong signal to look more closely at the rest of the poster before trusting its date.
