1991 Upper Deck Denny's Grand Slam Mark McGwire #10
1991
See all Mark McGwire cards & values1991 seasonOakland AthleticsMark McGwire career & card values
$1.90est. value (ungraded)
Prices updated 2026-10-22
Based on recorded sold prices how we price cards
Price by month
Average price of the 1991 Upper Deck Denny's Grand Slam Mark McGwire #10 each month, from 1 recorded price reading. Prices are re-checked regularly; a month's average counts each day from that month's first reading at the price that held that day.
| Month | Source | Average | Range |
|---|---|---|---|
| Oct 2026 | Market value | $1.90 | — |
Mark McGwire prices by grade
| Grade | Value | eBay |
|---|---|---|
| Ungraded | $1.90 | Buy on eBay ↗ |
| PSA 8 | $10.83 | Buy on eBay ↗ |
| PSA 9 | $19.99 | Buy on eBay ↗ |
| Grade 9.5 | $41.55 | Buy on eBay ↗ |
| PSA 10 | $109.94 | Buy on eBay ↗ |
| BGS 10 | $143.00 | Buy on eBay ↗ |
| CGC 10 | $66.00 | Buy on eBay ↗ |
| SGC 10 | $66.00 | Buy on eBay ↗ |
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Affiliate — we may earn a commission1991 Upper Deck Denny's Grand Slam Mark McGwire #10 value & prices
The 1991 Upper Deck Denny's Grand Slam Mark McGwire #10 is a Baseball card released in 1991. Ungraded copies carry a market value of about $1.90.
An ungraded copy is worth around $1.90, a PSA 9 around $19.99, a PSA 10 (Gem Mint) around $109.94 and a pristine BGS 10 around $143.00. That's roughly a 58× premium for a gem-mint copy over raw — one of the clearest signals that condition-sensitive buyers dominate this card's market.
Is it worth grading?
With raw copies near $1.90 and top grades reaching $109.94, grading a sharp copy of this card can clearly pay for itself — the spread comfortably covers a typical ~$25.00 grading fee. The catch: only submit copies with strong centering, clean corners, and unmarked surfaces, because anything below a 9 usually erases the math.
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