The card is from Topps, 1994. It looks like this was taken in Mesa during spring training, 1993 (he's wearing a home uniform, but Wrigley Field doesn't have a fence above the dugout.
And what is Rey signing?
His card from Topps 1993.
If you want the exact same card, signed by Rey, there's one on Ebay right now.
It will cost you $12. Its been sitting there since December, and its probably going to be there for a while longer, too. I'll wait for the price to come down. A few weeks ago I paid ten bucks for an autographed Billy Williams card. I don't think I'll pay two bucks more for Rey Sanchez.