SP baseball card set IS produced by Upper Deck, a major sports card manufacturer that started in
1989 with a premium issue. The 1989 Upper Deck set is very
well known for its inclusion of the extremely popular Ken
Griffey Jr. rookie card, and the back of the cards
featuring an anti-counterfeiting hologram.
The company produces sets for all sports, as well as other
lines of cards such as SP, SPX, SP Authentic, UD3, and