I just got this in the post today, it's a Ghanaian Movie Poster, you can buy them on ebay or on their website HERE. I wasn't sure what Yor was, so I had a look on IMDb, its an Italian film from the 80's, this is how they described it
"Yor, an extremely blond prehistoric warrior, comes to question his origins, particularly with regard to a mysterious medallion he wears. When he learns of a desert goddess who supposedly wears the same medallion, Yor decides that he must find her and learn his true identity. Along the way, he encounters ape-men, dinosaurs, and a strange futuristic society"