A 1991 Upper Deck Nolan Ryan - Ryan Heroes card number 15 has a book value of about .50 cents 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 "Ryan Heroes" cards read "1990 The Upper Deck company co." at the bottom but the set was issued in 1991. The 1991 Upper Deck Nolan Ryan - Ryan Heroes header card (No Number) has a boom value of $1.00
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A 1979 Topps Nolan Ryan card #115 has a book value of about $20.00 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 baseball card as a collectible losses it's value to the signature. The bulk of the value will rely on the pllayer that signed the card. 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.