What is the Slabline Score?

The Slabline Score is a credit-style 0–1000 protection score for a graded trading-card collection, blended from five weighted factors: Insurance (35%), Concentration (25%), Storage (20%), Liquidity (10%), and Provenance (10%). Higher is better; bands run A (≥880) to F (<400).

How does Slabline value my graded cards?

Each card is valued from recent comparable sales for the exact graded card (by certification number and grade), aggregated across eBay, Heritage, Goldin, and PWCC. More comps yield a tighter, higher-confidence value.

Does Slabline sell insurance?

No. Slabline is software that produces broker-ready insurance schedules and risk reports. It is not an insurer, broker, or appraiser and does not provide insurance, financial, or legal advice.

Which cards and categories does Slabline support?

Graded slabs from PSA, BGS, SGC, and CGC across baseball, basketball, football, soccer, Formula 1 / racing, hockey, Pokémon, and Magic.

How much does Slabline cost?

There is a free Ledger tier for up to 25 cards. Collector is $99/year (or $9.99/month) and removes the card limit for an unlimited collection. Insured is $149/year (or $14.99/month) and adds broker-ready insurance schedules and a weekly intelligence brief. A Vaulted tier adds connected Hobby Smart Case hardware.

What is the Hobby Smart Case?

A connected travel case (Travel 40, 75, and Pro) with per-slot temperature, humidity, light, and tamper monitoring, plus GPS location and a chain-of-custody log — turning storage risk into live, sensor-verified data. Launching Q2 2027.

How much is a PSA 9 1966 Topps Roberto Clemente #300 worth?

A PSA 9 1966 Topps Roberto Clemente #300 is worth approximately $1,722, based on recent comparable sales. Card values fluctuate with the market.

How does Slabline value the Roberto Clemente card?

Slabline values each graded card from recent comparable sales of the exact card and grade, aggregated across eBay, Heritage, Goldin, and Fanatics Collect. More sales yield a tighter, higher-confidence estimate.

How much is a raw (ungraded) 1966 Topps Roberto Clemente #300 worth?

A raw (ungraded) 1966 Topps Roberto Clemente #300 is worth about $201, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 7 1966 Topps Roberto Clemente #300 worth?

A PSA 7 1966 Topps Roberto Clemente #300 is worth about $1,722, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

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1966 Topps Roberto Clemente #300

Q: How does Slabline value my graded cards?

Each card is valued from recent comparable sales for the exact graded card (by certification number and grade), aggregated across eBay, Heritage, Goldin, and PWCC. More comps yield a tighter, higher-confidence value.

Q: Does Slabline sell insurance?

No. Slabline is software that produces broker-ready insurance schedules and risk reports. It is not an insurer, broker, or appraiser and does not provide insurance, financial, or legal advice.

Q: Which cards and categories does Slabline support?

Graded slabs from PSA, BGS, SGC, and CGC across baseball, basketball, football, soccer, Formula 1 / racing, hockey, Pokémon, and Magic.

Q: How much does Slabline cost?

There is a free Ledger tier for up to 25 cards. Collector is $99/year (or $9.99/month) and removes the card limit for an unlimited collection. Insured is $149/year (or $14.99/month) and adds broker-ready insurance schedules and a weekly intelligence brief. A Vaulted tier adds connected Hobby Smart Case hardware.

Q: What is the Hobby Smart Case?

A connected travel case (Travel 40, 75, and Pro) with per-slot temperature, humidity, light, and tamper monitoring, plus GPS location and a chain-of-custody log — turning storage risk into live, sensor-verified data. Launching Q2 2027.

What a PSA 9 is worth — from real comparable sales.

1966 Topps checklist→Baseball market index-2.5% 1W Roberto Clemente index-0.7% 1W

Estimated value · PSA 9

$1,722

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Based on 2 recorded sales of this card at PSA 9 (latest Aug 16, 2026) — price guides differ on this card.

Tracked history · PSA 9

Current value

$1,722

Sales, past year (all grades)

Price checked today · last recorded sale 1 months ago at REA (PSA 9) · 1 sale in the last 90 days

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Value by grade

How much the 1966 Topps Roberto Clemente #300 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	$201	guide, rescaled to sales
Grade 7	$1,722	guide, rescaled to sales

Loading every grader…

Recorded sales · all grades

Highest Baseball sales →

Auction houses (22)

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.

Prices realized at REA, SCP Auctions and Huggins & Scott, read from their public archives. Each lot carries its own grade.

Grade range

All venues · 22 sales · 2022–2026

▲ 64.0% first → latest

Hover for any sale · click to find it in the list

Log scale — the prices span more than 20×.

Aug 16, 2026 · REA · PSA 8$1,722
May 20, 2026 · REA · PSA 5$148
Jan 20, 2026 · REA · SGC 4.5$86
Jan 20, 2026 · REA · PSA 3$49
2025Aug 16, 2025 · REA · PSA 8$1,680
Jan 20, 2025 · REA · PSA 8$1,182
2024Oct 20, 2024 · REA · PSA 4$66
Sep 20, 2024 · REA · SGC 5.5$156
Aug 16, 2024 · REA · PSA 8$1,140
Mar 20, 2024 · REA · SGC 7$300

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Liquidity

Market value

$1,722

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Quick-sale recovery

≈ $1,033

60% recovered

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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Frequently asked

How much is a PSA 9 1966 Topps Roberto Clemente #300 worth?: A PSA 9 1966 Topps Roberto Clemente #300 is worth approximately $1,722, based on recent comparable sales. Card values fluctuate with the market.
How does Slabline value the Roberto Clemente card?: Slabline values each graded card from recent comparable sales of the exact card and grade, aggregated across eBay, Heritage, Goldin, and Fanatics Collect. More sales yield a tighter, higher-confidence estimate.
How much is a raw (ungraded) 1966 Topps Roberto Clemente #300 worth?: A raw (ungraded) 1966 Topps Roberto Clemente #300 is worth about $201, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 7 1966 Topps Roberto Clemente #300 worth?: A PSA 7 1966 Topps Roberto Clemente #300 is worth about $1,722, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much would I actually get selling the 1966 Topps Roberto Clemente #300?: A quick sale to a dealer typically recovers about 60% of market value — roughly $1,033 on this card's $1,722 value. An auction or private sale can recover more but takes longer and charges fees. The gap between market value and quick-sale recovery is the card's liquidity risk.

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Guides

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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.