"Lost" Tramp Artwork

It's always fun to come across a piece of old school art you've never seen before, especially when it's by an artist like Dave Trampier. Not long ago, I was given a collection of old issues of Polyhedron, whose issue #5 (April 1982) includes the following illustration:

Has anyone else ever seen this before? Obviously, it's an homage/parody of Dave Sutherland's famous cover to module B1, In Search of the Unknown, but I have to wonder about why it was drawn and when. One of the things I find most interesting about this piece is how much the three figures remind me of some of the characters from the Wormy strips. Of course, it's also a reminder of just how sad it is that Tramp left the industry -- and art -- for good.