Frank Kelly Freas painting Ace Sci Fi Space cover...

This is my first FREAS painting!! Image is approx 4.5" X 6.5" . Acrylic on clear Acetate. Rocket airship w/ bubble helmet astronaut(or maybe even steampunk machine + pilot?). Looks to me an overlay for interior piece, maybe Analog mag piece??? Listed by seller as an ACE book cover. If you have seen it/know exactly, please drop a line. I'm a comic freek(Yeah, Freas did MAD comic covers, too), but never dreamed of having Science Fiction cover stuff (He had like 11 Hugos!!!), love the piece. HELP me find the printed version if you can/know it, fellow CAF experts, please! Best to all! Lance