Slabline™
Graded-card protection score
Slabline™All graded cards →What a PSA 8 is worth — price-guide estimate, with every recorded sale we hold.
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eBay, Fanatics Collect, Alt, MySlabs, Goldin and Heritage records arrive through CardHedge's licensed feed; REA, SCP and Huggins & Scott are read from each house's published prices realized. More eBay, Goldin and auction sales come from The Card API.
Prices realized at REA, SCP Auctions and Huggins & Scott, read from their public archives. Each lot carries its own grade.
A PSA 8 1948 Leaf Boxing Jack Johnson #17 is worth about $150, the median of its 3 most recent recorded PSA 8 sales. Slabline holds 2 recorded PSA 8 sales of this card between December 2022 and December 2023; the most recent sold for $1,620 on December 6, 2023. At other grades it is valued at about $108 (Raw / Ungraded), $396 (Grade 9), $727 (Grade 9.5).
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How much the 1948 Leaf Boxing Jack Johnson #17 is worth at each grade.
How to read this page: an estimate is Slabline's figure for a grade, built from the source named beside it. An observed price is the latest price a grader's copy of this card fetched, one cell per grader and grade in the grid below. A recorded sale is a dated transaction with its venue. The headline above is the estimate for this slab's own grade.
| Grade | Value | Built from |
|---|---|---|
| Raw / Ungraded | $108 | guide, rescaled to sales |
| Grade 8 | $150 | recorded sales |
| Grade 9 | $396 | guide, rescaled to sales |
| Grade 9.5 | $727 | guide, rescaled to sales |
| Gem Mint 10 | $2,648 | guide, rescaled to sales |
Price guide data: SportsCardsPro
Price checked today · last recorded sale 2 years ago at REA (PSA 8) · 2 sales in the last 90 days (all grades)
A dealer typically pays about 60% of market for a fast, guaranteed sale — the rest is the liquidity gap. An auction or private sale can recover more but takes time and fees. It’s why your Slabline Score weighs liquidity — and why insuring at market matters: a fire-sale recovers far less than the number you’re covered for.
Estimated from dealer buy-vs-sell spreads; actual offers vary by condition and demand.
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Add to my collection — free →Values are informational estimates built from recent comparable sales — not a certified appraisal, insurance, or financial advice. Card values fluctuate; figures are a snapshot and may differ from a realized sale.