![Mark McGwire [Proof] #TH20 (Baseball Cards 1999 Topps Gallery Heritage) — is it worth grading?](https://i.ebayimg.com/images/g/jQkAAeSwBFtqYl9N/s-l1600.jpg)
Is Mark McGwire [Proof] #TH20 worth grading?
Baseball · Baseball Cards 1999 Topps Gallery Heritage · full price guide →
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.
- Raw (NM)
- $16.98
- Grade 9.5
- $15.00
- PSA 9
- $13.50
- Gem premium
- 0.9×
- As of
- Jul 11, 2026
Break-even by outcome and fee
| If it comes back… | Sells for | Economy / bulk (~$25.00) | Standard (~$50.00) | Express (~$150) |
|---|---|---|---|---|
| Gem — Grade 9.5 | $15.00 | −$26.98 | −$51.98 | −$152 |
| PSA 9 | $13.50 | −$28.48 | −$53.48 | −$153 |
Net = sale price − $16.98 raw value − fee. Fee tiers are illustrative; plug your grader's current price into the calculator below.
Expected value — how often does it need to gem?
| Chance it gems | Expected sale | Expected net (standard fee) |
|---|---|---|
| 25% | $13.88 | −$53.11 |
| 50% | $14.25 | −$52.73 |
| 75% | $14.63 | −$52.36 |
At the standard fee this submission does not break even at any realistic gem rate unless the miss lands above the 9 price.
Full grade ladder
Raw conditions & history →| Grade | Graded |
|---|---|
| 9.5 | $15.00 |
| 9 | $13.50 |
Run your own numbers
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
Other 1999 Topps Gallery Heritage cards worth checking
Full set checklist →![Kerry Wood [Proof] #TH14 1999 Topps Gallery Heritage card](https://i.ebayimg.com/images/g/HjAAAeSwQZZpVYf9/s-l500.jpg)
Grading Mark McGwire [Proof] #TH20 — FAQ
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.
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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