It's funny you should post this Question Bruce, I'm in this position.
I have two posters that need some TLC, one of them has the boarders trimmed, and the other has a corner missing, where there was a printers name and a code number. The one with the boarders trimmed also has quite a lot of info missing, which I know, but it also has the code number missing. Yes some Quads have Numbers...
I've been searching for years to find this info, but have failed so far. There's No other copies of these posters out there, and they are likely the only ones left. Press-books won't give the info I'm after, and No records exist.
I've waited this long because, not having all the correct info on would annoy me, and I want the restoration all done in one go. However it looks like I'm just going to have to send them to be done, and if the info turns up ever.. send them to get it added.
As a collector do want everything correct on these posters, but there's noway I could even think of just making something up, this would annoy me even more than the posters not having the info...
Anyway the upshot is they will be going for resto very soon....As soon as I find the best out there.