Bruce Hershenson sold a 1961 Black Sunday half sheet in September, 2000, for $110. He sold an insert for $107 in 2004. And, he sold a one sheet in October for $300. I have heard some collectors say that a half sheet is literally half of the value of the one sheet. This sounds a bit too literal for me, but that would suggest that $150 would be a decent price for that poster. That would be a $40 increase of the 2000 sale of the same poster.

Hershenson probably sells more vintage posters than just about anybody else in the world. You can check out Bruce's site at emovieposter.com. He has an extensive database of auction prices that were realized for his sales.