As a follow up to the post about the Barks drawing that wasn't by Barks, I can add that the Scandinavian cover is yet another version.
The redrawn version pictured here was used as a cover in early 1958. (Swedish KA&C:o 10-1958.)
Notice that the dollar sign has been substituted. Wonder what happened to all those early Egmont originals.
The earliest cover I've seen the original art to is Einar Lagervalls octopus cover from early 1967. Anyone aware of any earlier Scandinavian original cover art?