A 1990 Upper Deck George Brett card number 124 has a book value of about $1.25 in near/mint -mint condition. Professionally graded cards will sell for more money than a non-graded card in the same condition. 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.
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A George Brett. autographed baseball card is worth between $35.-$50. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been authenticated could sell at half the market value or less.
In general, collectors of baseball cards would rather have a baseball card without the signature. The signature would be considered as a flaw in the condition of the card and will lower the value. An inexpensive card will benefit, but if the value grows in the future it will be held back by the growth of the value of the signature