The bust comes with a full-color certificate of authenticity signed by the sculptor and numbered. Your number will differ, as will all the numbers of the 4000 piece run. There is also a limited edition of this bust that is limited to only 500 pieces with enhanced silver paint and glow-in-the-dark highlights. The Ultimate Thor might not like that it was made in China, but if you donate some money to charity all will be forgiven.
This is the limited 500 version.