Around $2.00. That is his second year playing. His 1987 Donruss is worth $8.00.
Chances are that the baseball was retrieved, and given to Mark McGwire. If the baseball was never retrieved, it would be difficult to impossible to prove that the baseball was mark McGwire's first home run baseball. To determine the value of the baseball it would have to sell on the market, and the selling price would be the value. See Related questions below for the values of other Mark McGwire Home Run baseballs.
1988 Topps Mark McGwire card number 580A 1988 Topps Mark McGwire card number 580 has a book value of about $1.50 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.
1988 Fleer Mark McGwire card 286A 1988 Fleer Mark McGwire card #286 has a book value of about $2.50 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.
1988 Topps Mark McGwire card number 580A 1988 Topps Mark McGwire card number 580 has a book value of about $1.50 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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1988 Fleer Mark McGwire card 286A 1988 Fleer Mark McGwire card #286 has a book value of about $2.50 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.
A Mark McGwire Cracker Jack Commemorative baseball recently sold for $5.00 in an on line auction
Mark McGwire baseball cards range anywhere from $25 to $378 dollars. Mark McGwire is a former major league baseball player.
A 1988 Score Mark McGwire baseball card # 5 has a book value of about $1.50 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.
1988 Score Mark McGwire baseball card number 659A 1988 Score Mark McGwire baseball card number 659 has a book value of about .35 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.
Mark McGwire signed baseball cardYou did not include what item Mark McGwire signed from 1988. I'm going to take it that it is a 1988 baseball card.A Mark McGwire signed baseball card is worth between $50.-$75.Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less.It doesn't' matter too much on which card was signed. 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 of the card as a collectible. 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.
Probably not any more than about $2 USD.