I think the cleanup went great, despite an imperfect scan. Poster is your typical blocky woodblock or silkscreen print of the time, and you can see slight imperfections on the black border where it didn't quite reach the paper (it's cropped to the edge of the paper, somewhat by necessity as the scan is on some sides). Historical value is what really pushes this into valuable and featurable; this is the kind of artefact that you're surprised still exists.
I think the cleanup went great, despite an imperfect scan. Poster is your typical blocky woodblock or silkscreen print of the time, and you can see slight imperfections on the black border where it didn't quite reach the paper (it's cropped to the edge of the paper, somewhat by necessity as the scan is on some sides). Historical value is what really pushes this into valuable and featurable; this is the kind of artefact that you're surprised still exists.