Remember those rolls of unfolded Woodstock Style C one-sheet posters that turned up all over the place a while ago? There was debate over whether it was a genuine 1970 movie poster, and there were supporters on both sides.
I think I now know the probable solution.
What happened? I was consigned a Woodstock Style C one-sheet, and while it looks LIKE the rolls of recent ones, it is NOT the same.
Here is the one I was consigned:
http://www.emovieposter.com/unused/woodstock/woodstock_styleC_teaser_linen_NZ02826_L.jpgHere is an example of the suspect one:
http://www.emovieposter.com/unused/woodstock/woodstock_styleC_linen_LB01341_L.jpgAt first glance, they look like the same poster, but one has credits and the other is a teaser.
But look closer! The "teaser one" has sharp clear printing on the letters of the title and the guitar, and the other one has ragged color in those areas.
The other one also has Copyright 1969 by Magnum Photos Inc in the bottom right, and the "teaser one" does not.
The "teaser one" has machine folds, and when you hold the linen to the light, you can see it was stamped on the back, and the other one was never folded and never stamped.
What is Magnum Photos Inc? They are a photo leasing outfit in New York City. Since this poster has NO photo on it, only art, I think the only reasonable assumption is that what they leased was a photo of the entire poster.
So my best guess is that the newly surfaced posters are commercial posters (which would explain why they are unfolded) that are either from 1970 or later, and that someone found a stash of these (it may be that they were never sold commercially, since I can find no source that had it for sale before these turned up).
You can put whatever value you want on them, but I think it is wrong (in the face of this evidence) to call it a movie poster.
Bruce