Cards › 2026 Topps 1991 Autograph Mark McGwire #91A-MMG
Is the 2026 Topps 1991 Autograph Mark McGwire #91A-MMG worth grading?
Live market numbers as of 2026-10-21 — raw vs. graded value, PSA 10 gem rate, and the breakeven math.
Raw value
$104.61
PSA 9 value
$177.12
PSA 10 value
$495.32
PSA 10 gem rate
0%
Based on the numbers below, this card is potentially worth grading — a PSA 10 nets an estimated $223, but the 0% gem rate means the 10 is far from guaranteed. Weigh the PSA 9 outcome below.
The breakeven math
| Line item | Amount |
|---|---|
| Raw purchase | $104.61 |
| Sales tax (8%) | $8.37 |
| Grading fee (priority tier) | $80.00 |
| Shipping | $5.00 |
| Total cost basis | $197.98 |
| Net at PSA 10 (85% payout) | +$223.04 (+113%) |
| Net at PSA 9 (the downside case) | −$47.43 |
Assumptions: $80 grading, $5 shipping, 8% tax on the raw purchase, and keeping 85% of the sale after marketplace fees. Your numbers will differ — run them below.
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Start free trialCard pricing data provided by SportsCardsPro, a service of PriceCharting. Gem rates reflect recent PSA population data (3 graded submissions). Not investment advice — grading outcomes are probabilistic and markets move. © Summit Sports Cards · About · Pricing