JANE RUSSELL VINTAGE POSTER

I have an all plastic vintage poster 35.5"h 35 "w of "THE OUTLAW and was wondering what you think it is worth..
It is printed or PAINTED on to the board or in the board. It is a hard thick plastic board. IT IS NOT A GLUED ON POSTER. My father has it over 40 years. It was given to him BY SOME SORT OF A DEALER in the 60's. ON THE BACK OF THE POSTER MFG. UNDER U.S. PATENT AND PAT. PEND.

Thanks,
Irving 914-588-5829