in December 2009 I sold the rolled International style in my auctions for $1112.00.
It was a surprising result, but the direct underbidders were (all three) dealers.
Just a week later, John reid sold one in a little less condition (I think it had edge wear on one side, or maybe I'm wrong) and he got $900 or $950 in a fast set sale within 48 hours of listing the poster
the two that sold on ebay UK for 300-400+ were poorly promoted, folded, and both for auction by the same seller ending on the same day. In other words, everything about the way those were sold was wrong, and they still commanded a good price.
therefore, it has to be assumed that the poster is really a very highly valued item.
I'll trade the NM rolled copy in my collection for certain posters from Double Indemnity, Big Sleep or Blue Dahlia, or for an original release Murder My Sweet UK Quad, which is properly titled Farewell My Lovely.