Soccer star Lionel Messi's first unofficial contract with FC Barcelona was done on a napkin. It's now going to auction with a starting bid of nearly $400,000.

All of the other known Gorgosaurus skeletons are in museum collections, making this one the only specimen available for private ownership, Sotheby's said.

Sotheby's, Christie's and Phillips total sales have hit more than $2.5 billion for 2022 already, led by works by Andy Warhol, Jean-Michel Basquiat and Pablo Picasso.