The 1990 Topps set contains 792 standard-size cards. Cards were issued primarily in wax packs, rack packs and hobby and retail Christmas factory sets. Card fronts feature various colored borders with the player's name at the bottom and team name at top. Subsets include All-Stars (385-407), Turn Back the Clock (661-665) and Draft Picks (scattered throughout the set). The key Rookie Cards in this set are Juan Gonzalez, Marquis Grissom, Sammy Sosa, Frank Thomas, Larry Walker and Bernie Williams. The Frank Thomas card (#414A) was printed without his name on the front, as well as portions of the black borders being omitted, creating a scarce variation. Several additional cards in the set were subsequently discovered missing portions of the black borders or missing some of the black printing in the backgrounds of the photos that occured in the same printing that created the Thomas error. These cards are rarely seen and the Thomas card, for a newer issue, has experienced unprecedented growth as far as value. Be careful when purchasing the Frank Thomas NNOF version as counterfeits have been produced. A very few cards of President George Bush made their ways into packs. While these cards were supposed to have never been issued, a few collectors did receive these cards when opening packs.