The true completer to the PT52 collection features Autopilot from WALL-E and was never produced. This pin was sold in a set of two (the other being #79999) at both of Disney's 2010 pin celebrations: Dateline: Disneyland 1955 on July 10th, 2010; and Trade City, USA on August 27th, 2010. Both featured the set as lot #8 in their respective silent auctions. The third and final set lies in the Disney Vault. Does not contain "PP"on its backstamp.