@Markdav
I think Zombie speculated that they spliced that new scroll onto an already existing 1977 print.
I would hazard a guess that the "senator" print was done only for the UK re-release -which I saw in 1981(SW was shown back to back with ESB in the early summer of that year-my personal introduction to SW!)
For the 81' and 82' releases in the states they probably created new IN's and then spiced that scroll in.
Having said that-there is that fan who said that the print he saw in 82' was already pink and faded-so maybe that was a print from 77' with the new 81' scroll spliced in!