From Steve Jackson Games site:

"In August 2004, Steve Jackson Games released GURPS Fourth Edition, starting with the two-volume Basic Set. In addition to the regular Basic Set books, we did a special, one-time Deluxe Edition. We printed only as many as were pre-ordered, and we set aside a few for sale at Gen Con 2004 and for retail stores that asked very nicely. Odds are there aren't many of these left."

"These are truly deluxe books. Both volumes are bound in bonded leather with two-color foil stamping. They have buckram-textured endpapers and sewn head and foot bands. Book 1 includes a special full-color autograph page in front, with the signatures of Steve Jackson, Sean Punch, David Pulver, and Andrew Hackard. (Yes, real signatures, not printed copies.)"

"Each book has a full-color dust jacket, embossed, varnished, and foil stamped. The two volumes come in a heavyweight deluxe slipcase . . . also full-color and foil stamped, with linen texturing."

"In other words, these are NICE."