This is the C-3PO pin from the Star Wars Celebration Chicago 2019 convention pin trading set. This pin was available for purchase at the Star Wars Celebration Store as part of a 3-pin set. There were over 45 Star Wars Character pins in this set that was designed with art by Chrisie Zullo. The C-3PO pin measures approximately 5/8 inches wide by 1 5/8 inches tall. The back has a black finish with two posts and is back stamped with Lucasfilm Ltd and Made in China.