You are looking at an original 1-sheet theatrical poster of the very popular 1980 classic horror film, "Friday the 13th".   This original 1-sheet poster was signed by 5 cast members and 3 crew and they are:

Ari Lehman        -   Young Jason Voorhees

Ron Millkie         -   Motorcycle Cop

Robbie Morgan  -   "Annie" 

Adrienne King    -   "Alice" who was the final girl and survivor

Debbie Hayes     -  "Claudette" and first of two victims killed by Mrs. Voorhees at the beginning of the film

Sean Cunningham - Director

Steve Miller             - Associate Producer and went on to direct Part 2 and 3

Tom Savini              - Special Effects and created Jason (it was his idea to have the young Jason jump out of the lake; it was                                     not in the script so he put "Creator of Jason" 

This is a work in progress so I did not do the full JSA authentication yet but I guarantee it passes any authentication as I got each autograph myself.  Shipping via Priority Mail and poster will be placed in a hard plastic top load protector and shipped with signature confirmation is $15.  Check out my other neat Friday the 13th items in my store and take care.