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MattThanks for the background. I showed David Rudd a high resolution scan of the printing and he said based on the dot pattern that it is a photo engraving and definitely not a modern reproduction.
The only one I know of that sold at auction was this one:
http://www.huntauctions.com/online/imageviewer.cfm?auction_num=16&lot_num=979&lot_qua l=
if you have a link to another, I'd love to see it as it would be helpful.