If a Donruss card, approx. $.25 A Ruben Sierra card #35 from the 1989 Fleer MVP's set is worth about $1.00 in near/mint -mint condition. Professionally graded cards will sell for more. Condition is important.
Common flaws with Baseball cards include: rounded edges, creases, off centered, and faded color. Any or all flaws will devalue the card significantly.
The 1989 Fleer MVP's set of 44 cards was among the many box set issues, produced by Fleer from 1985 to 1990 that were intended to be exclusive releases for the various chain outlets such as Walgreens, Revco, McCrory's, Eckert's, 7-11, Ben Franklin, Toys 'R' Us, Kay Bee and others.
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A Rubien Sierra Single Signed Baseball is worth between $20.-$30.
Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions.