In my sleepiness last night I forgot to put the rest of the stuff that's written at the bottom...which is (c) 1980 Wizard and Genius - Idealcor AG...those guys have a website
http://www.wizard.ch/index.php
Unfortunately I looked through all 107 pages of posters and (unsurprisingly) they no longer have my poster or any others like it. They have an email...so I'll send a message about my poster later I think.
Edit: In my current sleepiness I forgot to thank all of you guys for giving me tips and neat links to follow for similar artwork. They're great but I'm still going to try and hunt down this artist if I can.