![Mark McGwire [Proof] #TH20 Baseball Cards 1999 Topps Gallery Heritage trading card — raw and PSA graded price guide](https://i.ebayimg.com/images/g/jQkAAeSwBFtqYl9N/s-l1600.jpg)
Mark McGwire [Proof] #TH20 Price Guide
Baseball · Baseball Cards 1999 Topps Gallery Heritage · Released 1999
Mark McGwire [Proof] #TH20 (Baseball Cards 1999 Topps Gallery Heritage) is currently worth $16.98 raw (near mint) (as of Jul 11, 2026). Values come from the PriceCharting price guide and are refreshed weekly. Grading is the single biggest value lever — check the raw-to-PSA-10 gap below, then scan your copy to see if its centering makes the grade.
Current prices
Raw (ungraded)
| Ungraded | $16.98 |
Graded — grade ladder
| Grade | Graded |
|---|---|
| 9.5 | $15.00 |
| 9 | $13.50 |
Last updated 2026-07-11 · Source: the PriceCharting price guide
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Is it worth grading?
Grading rarely pays for this card
Grade 9.5 copies of Mark McGwire [Proof] #TH20 sell for $15.00, only $0.00 above the $16.98 raw price — less than an economy-tier grading fee. A PSA 9 ($13.50) sells for less than raw, so anything short of a 10 loses money. Keep it raw unless you are grading for the slab itself.
Full grading break-even for Mark McGwire [Proof] #TH20: fee tiers, best grader, gem-rate math →
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
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Mark McGwire [Proof] #TH20 — frequently asked
How much is Mark McGwire [Proof] #TH20 (Baseball Cards 1999 Topps Gallery Heritage) worth?
As of Jul 11, 2026, Mark McGwire [Proof] #TH20 (Baseball Cards 1999 Topps Gallery Heritage): an ungraded near-mint copy sells for about $16.98, a Grade 9.5 sells for about $15.00, a PSA 9 for about $13.50. Values come from the PriceCharting price guide and are refreshed weekly.
Is Mark McGwire [Proof] #TH20 worth grading?
Grade 9.5 copies of Mark McGwire [Proof] #TH20 sell for $15.00, only $0.00 above the $16.98 raw price — less than an economy-tier grading fee. A PSA 9 ($13.50) sells for less than raw, so anything short of a 10 loses money. Keep it raw unless you are grading for the slab itself.
Where do these Baseball card prices come from?
Prices are the PriceCharting price guide, refreshed weekly. Raw values reflect near-mint (NM) ungraded copies; graded values are per grading company and grade.
Is your baseball card centered well enough to grade?
Centering makes or breaks a PSA 10. Scan any card with Midpoint to measure its exact centering, get a grade estimate, and see what your copy is actually worth.
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