Purchased this very rare piece of Aviation history at the 4 Points Swap Meet in Palmdale. The seller said it came out of the Lockheed Martin Plant 42 in Palmdale where they assembled and serviced the SR-71  Blackbird. The Skunkworks poster  measures 17" wide x 22"length and has a silver metallic finish. The poster is encased between 2 sheets of plexiglass 19"x 24" with hex screws attached with nuts and hung with a chain. I did a google  image search of the Skunk graphics and text but could not find another one exactly like it. The piece is old with significant agewear: hazing, dirt build up where the hex screws and nuts are securely attached to the plexiglass. The Skunkworks poster is intact with good  color and in very acceptable used condition (no rips or tears see image closeups) there is light wrinkling in 4 spots on the front  of the poster see image closeups.. The reverse side of the poster has soiling see image closeups. Any questions please contact me.