Created exclusively for Star Wars Celebration Europe, which was held at the ExCeL Exhibition Centre in London from July 13-15, 2007. Officially licensed by Lucasfilm, this is the official poster for the event and was available only at Lucasfilm's Celebration store at the event.
This piece did not come signed. However, the artist was at the show and signed many copies at his booth on the show floor. So finding signed copies of this piece on the secondary market may be somewhat common.
