A 1991 Post cereal Ken Griffey Jr card number 11 has a book value of about $1.25 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.
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A 1993 Upper Deck Clutch Performers Ken Griffey Jr card #R11 has a book value of about $2.00 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.
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. If the signature has a lower value than the card it will lower the value of the card. The un-signed card will have a higher value.
A Ken Griffey Jr baseball card is a poor choice to have Reggie Jackson sign and it will lower the value by at least half.