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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).

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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.

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How much is a PSA 10 1989 Fleer Ken Griffey Jr. #548 worth?

A PSA 10 1989 Fleer Ken Griffey Jr. #548 is worth approximately $350, the median of its 5 most recent recorded sales at this grade. Card values fluctuate with the market.

How does Slabline value the Ken Griffey Jr. card?

Slabline starts from the price guides for the card and grade. When it holds dated recorded sales of that exact card and grade — from CardHedge market data and the auction houses it ingests — the headline becomes the median of the most recent ones and the grade ladder rescales to match. Each row on the page names which of those it is.

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1989 Fleer Ken Griffey Jr. #548

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?

Slabline is free for up to 25 cards. Collector is $99/year (or $9.99/month) and removes the card and scan limits. Insured is $149/year (or $14.99/month) and adds a broker-ready insurance schedule and a weekly market brief.

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 10 is worth — from its recorded sales.

Estimated value · PSA 10

$350

Median of the last 5 recorded PSA 10 sales · Oct 2026 – Nov 2026

30D▼ 5.4%60D▼ 7.9%90D▲ 5.1%

Last sale

$336 · Nov 9

12-month range

$95–$948

584recorded sales· PSA 472 / SGC 42 / BGS 39 / CGC 14 / Raw 10 / ISA 2 / TAG 2

Recorded sales · PSA 10

Highest Baseball sales →

Grade 10 by grader · median of recent sales

ⓘ Where these sales come from

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.

Sales seen on eBay, Fanatics Collect, Goldin, Heritage, Alt and MySlabs, via CardHedge. "Marketplace" is a real CardHedge sale whose venue is not identified yet.

Marketplaces only · 197 sales · 2026

▲ 46.1% since Apr 2026

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

Nov 9, 2026 · Marketplace · PSA 10$336
Nov 8, 2026 · Marketplace · PSA 10$355
Nov 7, 2026 · Marketplace · PSA 10$350
Nov 4, 2026 · Marketplace · PSA 10$330
Nov 2, 2026 · eBay · PSA 10$380
Nov 1, 2026 · Marketplace · PSA 10$340
Oct 30, 2026 · Marketplace · PSA 10$362
Oct 30, 2026 · eBay · PSA 10$375
Oct 28, 2026 · Marketplace · PSA 10$257
Oct 26, 2026 · Marketplace · PSA 10$392

A PSA 10 1989 Fleer Ken Griffey Jr. #548 is worth about $350, the median of its 5 most recent recorded PSA 10 sales. Slabline holds 200 recorded PSA 10 sales of this card between April 2026 and November 2026; the most recent sold for $336 on November 9, 2026.

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1989 Fleer checklistChecklist→Baseball index+0.4% 1W

Sales by grade · weekly median

Each point is one week's median recorded sale · tap the chart to read it

Log scale — prices across these grades span more than 20×.

Value by grade

How much the 1989 Fleer Ken Griffey Jr. #548 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
Gem Mint 10	$350	5 recorded sales

Price guide data: SportsCardsPro

Loading every grader…

Tracked history · PSA 10

Current value

$350

Recorded sales, past year (all grades)

554

Price checked today · last recorded sale 2 days ago (PSA 10) · 335 sales in the last 90 days (all grades)

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Frequently asked

How much is a PSA 10 1989 Fleer Ken Griffey Jr. #548 worth?: A PSA 10 1989 Fleer Ken Griffey Jr. #548 is worth approximately $350, the median of its 5 most recent recorded sales at this grade. Card values fluctuate with the market.
How does Slabline value the Ken Griffey Jr. card?: Slabline starts from the price guides for the card and grade. When it holds dated recorded sales of that exact card and grade — from CardHedge market data and the auction houses it ingests — the headline becomes the median of the most recent ones and the grade ladder rescales to match. Each row on the page names which of those it is.

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