Value of Bert blyleven autographed baseball card?

Answer 1

Bert Blyleven autographed baseball cardA Bert Blyleven autographed Baseball card is worth between $10.-$15. 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.