In 1996, Donruss introduced Leaf Signature. It was the first set to feature a large number of autographed card. Each pack had at least one autographed card. There were over 1,000 different autographed cards available in several parallel sets. In 1997, Donruss renamed the set Donruss Signature, and continued the set into 1998. Donruss went bankrupt after 1998 and disappeared for a few years. Just like with the Leaf Signature, there was at least one autographed card per pack.
1998 Donruss Signature #83, Roberto AlomarThere was nothing particularly exciting about the design of the base cards, in fact they looked pretty much like the 1997 versions. A moderately glossy card with silver foil.
The back featured a player photo and personal and game stats.
1998 Donruss Signature Autographs Millennium Gabe Alvarez
There were 3 125-card parallel sets of on-card autographs. This set featured 1,000, serially numbered cards of each player. The 'base' autographed card was also serial numbered to various amounts between 400 and at least 3,900. There was also a Centennial version, serial numbered to 100. Gabe Alvarez only played about 90 games but I only paid $4.00 for this on-card auto.
The backs featured another photo and some biographical information about the player.