There's usually (as a rule of thumb), only printers credits on first release posters, A re-release wouldn't on a lot of occasions have it. The projectionist may be misremembering when it was shown, they do show a lot of films..
we know due to the cert it was a later release, when certain scenes were reinstated, and was awarded a higher cert.
There has been a few about, but I could give you any number of posters, and you won't find any now, people are hanging on to them. This don't mean they were printed in any less numbers..
If you want to sell it, at it's true value, either send it to Bruce, and let him auction it, or put it on the Bay with a stating bid of £1, and see where it goes...