Data quality warnings
Limited comp historyStale comp data
PSA
Michael Jordan
8
Basketball
Michael Jordan
1986 Fleer
Fleer #57
Rookie card
1986 Fleer Fleer Michael Jordan
PSA 8 · Rookie
Fair value
N/A
Market price
N/A
Margin of safety
N/A
Margin unavailable
30-day avg
N/A
90 / 180 avg
N/A / N/A
Opportunity Score
SlabSignal Methodology v2.0.0
Scores are based on the current SlabSignal methodology version.36 · Pass
Data Quality 18 - Poor
Score Audit Trail
Exact component scores and weights used in the current methodology.
1/5 - Low-Confidence Speculative
Confidence is low.
Data quality is weak.
36 - Pass
Data Quality 18 - Poor
Conviction 18
Value
50
25% weight
Momentum
50
15% weight
Liquidity
0
15% weight
Confidence
25
15% weight
Risk
55
10% weight
Data Quality
18
10% weight
Margin
50
10% weight
This is decision-support research, not a guarantee of future performance.
Price trend
Explanation
- Margin of safety is unavailable until fair value and market price are available.
- Fair value and market price require more valid comp data.
- Liquidity is limited with 0 valid sales in the last 90 days.
- Momentum is neutral based on recent sale averages.
- Conviction is very low conviction based on confidence, data quality, liquidity, volatility, and source depth.
Valid comps
0
last 365 days
90-day sales
0
liquidity input
Data quality
18 / 100
Poor
Volatility
N/A
coefficient of variation
Recent comps
| Date | Source | Type | Total |
|---|---|---|---|
| 2026-06-24 | Goldin | auction | $8,820 |
| 2026-06-13 | eBay | auction | $7,125 |
| 2026-05-29 | Heritage | auction | $8,376 |
| 2026-05-05 | eBay | buy it now | $6,800 |
| 2026-04-11 | Alt | auction | $6,710 |
| 2026-02-27 | Goldin | auction | $7,830 |
Population snapshots
| Date | Total | Grade | Higher |
|---|---|---|---|
| 2025-07-01 | 3010 | 920 | 242 |
| 2026-01-01 | 3048 | 932 | 244 |
| 2026-07-01 | 3072 | 940 | 247 |