What is the value of a 1991 World Series souvenir score book?
A 1991 Minnesota Twins World Series program played at The Metrodome is worth about 15.-$20. in excellent - near/mint condition. A 1991 Atlanta Braves World Series program played at Atlanta-Fulton County Stadium is worth $10.-$15. As with all collectibles, condition is the most important factor of all providing that the item is authentic. With programs/scorecards the slightest flaws will bring the price down significantly. An exceptional mint condition scorecard could sell for more.
Common flaws would be staining, foxing (yellowing), fading, creases, rips, loose pages, cracked binding, and writing on the cover. Un-scored programs will generally sell at a higher price than a scored program but sometimes it doesn't effect value. The over all condition, and how well the cover displays will.
The value on a "scored" program as opposed to a un-scored program can vary depending on the game, and collectors preference. In general I would say an un-scored program will sell at a higher price. Some collectors do not mind scored programs, or might prefer it scored. A game in note that might sell at a higher price "scored" would be Don Larsens perfect game in the World Series.