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The year Mark McGwire broke Roger Maris's record in 1998 McGwire hit 70 Home runs, and hit 65 the following year in 1999. Mark McGwire's 63rd Home Run ball sold for $50,000. at the same auction that saw McGwire's 70th Home Run ball sell at a record $3 million in 1999. Keep in mind this is also before the steroid scandal, and both baseballs might sell at a much lower price today.
The groundskeeper Tom Forneris retrieved Mark McGwire's home run ball number 62 (1998). The baseball was returned to McGwire, and was later sent to the baseball HOF in Cooperstown.
I have this card set and I estimate that the book value for the entire card set made by Topps commemorating the 70 home runs by McGwire in 1999 is based around $700- $800. If you were to sell this to a card seller then you would probably only get $500.
Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Signatures that have not been properly authenticated could sell at half the market value or less.
Inscriptions such as "70" will sell for more. Personal Inscriptions like Good Luck Chuck" will sell for less.
In a recent auction a Mark McGwire single signed baseball sold for $131.45 another signed on a 1998 All-Star Game baseball sold for $179.
Your card is work 10-15 dollars depending on condition and if it is still packaged