Six foot Marilyn Monroe poster found in garage

I found the attached poster in my garage a week ago. It was rolled up and tucked away in a rafter behind my garage light. I've noticed it before but never paid any attention to it because I thought it was just wrapping paper.

I purchased my home about 3 and a half years ago and this is not the first poster I have found tucked away by the previous homeowners. I found other posters in the drop ceiling in my basement; I might post those posters later.

I took this poster down to throw it away but decided to unroll it a little and lo and behold, Marilyn Monroe.

As you can see in the pictures, the poster is not in the best condition. Not sure if it is an original but the poster seems pretty delicate and the paper the poster is made out of is fairly thin. Also, there are no identifying marks on the poster. No print, no date, nothing.

Does anyone know and/or have any information on this poster?