Found two threads that might be helpful. I didn't read through them completely so you'll just have to check 'em out.
http://tarotforum.net/search.php?searchid=5337569
Does the booklet advertise any other books or decks? That could help you narrow a time frame. I'd say they were made at least after 1979 given the copyright on the booklet.
So how does it look like now?
Cool!