I see I missed two comments about that Empire Strikes Back 6 sheet:
Harry wrote: "That is definitely a crazy rare poster Bruce... who consigned it? Was it someone who worked for the studio? Could it be a foreign issue (no rating)?"
Harry. it DID come from another country, and it WAS used in a theater, and it was in a pile of theater used posters. You may not know it, but 99% of the post 1975 three and six sheets were solely printed for use in other countries (they are all stamped "foreign" on the back) and it seems that the U.S. stopped using them, but non-U.S. ones kept on (like with lobby cards).
Jay wrote: "No matter what it sells for, my bet is that it ENDS at Poster Mountain or some other restoration shop. Real question is what it sells for next year, linenbacked and restored."
Usually you might be right Jay (and of course often the next auction house "forgets" to note the restoration), but in this case NO WAY because the high bidder (and the underbidder) are completionists who would never sell it (but I am sure it WILL be restored, and it will be relatively easy, because they have a perfect reference for the missing art).
Bruce