The 1986 Donruss card 139 is Denny Walling. The card you have, Mike Schmidt card 139 was issued by Donruss in 1987. The last year of stats listed, reflect the 1986 season. A 1987 Donruss Mike Schmidt Baseball card number 139 has a book value of 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.
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