Northrop Space Art

I recently bought a Northrop lithograph off of eBay as part of the Patreon upsurge. Sadly, though, the seller screwed up… according to him, the images he posted were not those of the lithograph he was actually selling, but were mistakenly swapped with another Northrop space art lithograph. So I got the wrong one.The one I got was nice, but not the one I was after; and the one I was after… was already gone. Bah. Sometimes things don’t quite work out.

Anyway, this is the lithograph I was *supposed to get:

This is undated, but most likely is from the very late 1950’s or early 1960’s and depicts something vaguely X-15-like (but clearly much larger) going past the moon. Sadly, I have no further information. Is this known to anyone hereabouts?