John Wayne Gacy aka the "Killer Clown" and "Pogo the Clown" was a Des Plaines, Illinois serial killer convicted of 33 murders executed by the state of Illinois via lethal injection on May 10, 1994.
 
8 1/2” x 11” vintage unissued P.D.M. Contractors stock certificate. Two pages in all. The first two scans show the front and the back of the certificate. 
Only a few of these unissued certificates are known to exist. 
Not a reproduction.