Mark McGwire SIGNED Baseball BAS COA
Updated August 6, 2026
| Lot number | 0231 |
| Estimate | $75 - $125 |
| Opening bid | $40 |
| Auction | Sports Cards & Memorabilia, Comics +++ |
| Date | August 12, 2026 at 12:00 PM EDT |
| Auction house | Grant Zahajko Auctions, LLC |
| Location | Davenport, Washington |
Beckett Authentication Services # BW78135. Lot measures 3.25 x 3.25 x 3.25 in. for shipping purposes only. The absence of a condition report does not imply that the lot is in perfect condition or
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