Did you get #303 intentionally (being Denver's area code) or did you somehow luck into that? Having #21 is super-rad.
The only other numbered collectible I have in my house is "a painting that was done by Chewbacca." My friend's parents went to the Bahamas and ran into "the guy who played Chewbacca" and now he paints paintings and does numbered lithographs and they were cheap so they got me one.
After a bit of research I later determined that the artwork was not done by "the guy who played Chewbacca" (Peter Mayhew), but rather the guy who worked on Chewbacca's makeup or something. I don't know if my friend's parents have ever actually seen Star Wars, but the first giveaway should have been that Peter Mayhew is seven-foot-three ...