Porsche 928
For the Porsche 928 market, scores indicate a depreciation risk of 63.27 and liquidity at 34.97. Forecasts point to a slight upward direction with probabilities ranging from 0.52 to 0.55 over the next 6 to 24 months, within a volatile regime. Real Disposable Income per Capita serves as a strong leading indicator for this market, showing a 0.79 correlation with a 21-month lead time.
What It's Actually Worth
Blended value of a standard 37 yr, 76k mi example, ~$21.9K now. The green line weighs confirmed auction sales most heavily (the amber dots — what cars actually hammered for), blends in fast-selling "just-missed" listings, and lightly smooths out month-to-month composition noise.
Did our model work? 57% direction calls right
Each faint amber line is a forecast we would have made at that point in the past (12-mo horizon), drawn against what actually happened (blue). Over 124 scored forecasts: 57% got the direction right, median value error ±39%.
Walk-forward: each ghost uses only data available at that date — no hindsight. Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Auction Scorecard gavel in range 7 in 10
We replayed 576 past auctions in this market — predicting each hammer price from market data before the sale (no hindsight). Typical miss: ±40%; the gavel landed inside our predicted range 7 in 10 of the time, and we lean slightly low on average.
| Sold | Car | Our range | Hammer | |
|---|---|---|---|---|
| 2026-06-23 | 1991 · 97k mi | $10.9K–$40.1K | $32.0K | ✓ |
| 2026-06-23 | 1988 · 90k mi | $11.3K–$41.3K | $12.0K | ✓ |
| 2026-06-21 | 1994 · 6k mi | $17.9K–$65.8K | $145K | ✗ |
| 2026-06-19 | 1993 · 87k mi | $11.4K–$41.9K | $44.5K | ✗ |
| 2026-06-18 | 1993 · 111k mi | $10.0K–$36.6K | $122K | ✗ |
| 2026-06-17 | 1990 · 44738k mi | $9.2K–$33.6K | $26.5K | ✓ |
| 2026-06-16 | 1985 · 123k mi | $9.3K–$34.0K | $15.0K | ✓ |
| 2026-06-15 | 1988 · 61k mi | $13.2K–$48.4K | $34.5K | ✓ |
Live now — calling it before the gavel
We're currently tracking 8 open auctions in this market. Here's our predicted hammer range for each — check back after they close.
| Closes | Car | Source | Our predicted range |
|---|---|---|---|
| open | 1989 · 118k mi | classic | $7.4K–$40.0K ($17.2K) |
| open | 1980 · 132k mi | ebay | $6.8K–$36.5K ($15.8K) |
| open | 1988 | C&B | $9.4K–$50.7K ($21.9K) |
| open | 1993 · 86k mi | classic | $9.0K–$48.5K ($20.9K) |
| open | 1985 · 115k mi | ebay | $7.7K–$41.2K ($17.8K) |
| open | 1979 · 68k mi | classic | $9.7K–$52.2K ($22.5K) |
| open | 1991 · 86k mi | classic | $9.4K–$50.7K ($21.8K) |
| open | 1993 · 122k mi | BaT | $7.5K–$40.6K ($17.5K) |
No-lookahead: predictions are made before each auction closes; the scorecard grades confirmed sold auctions only (no-sales excluded). A modeled estimate, not a guarantee. Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Where We Think It's Headed
Probability and range, not a single number. Wider = less certain (not bigger gains).
| Horizon | Direction | Probability | Confidence | Past accuracy |
|---|---|---|---|---|
| 6 mo | UP | 52% | Low | 53% |
| 12 mo | UP | 54% | Low | 57% |
| 24 mo | UP | 55% | Low | 70% |
Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Crystal Ball — What Leading Indicators Signal
Distinct from the trend forecast above: this blends all 8 leading indicators (each at its own lead time, de-duplicated so correlated ones don't double-count) into one signal. Leading indicators are collectively signaling higher over the next ~12 months (moderate conviction — 49% of weighted drivers agree), driven mainly by Ethereum (USD) and 10-Year Treasury Yield, though Ethereum (USD) points the other way.
Are the indicators agreeing?
Each bar is one driver's current push; longer = more weight. All one side = high conviction; split = low.
If You’d Bought in 2012
$100K invested 2012-03 → today (14.3 yrs), this car vs where else you could've put the money. Rebased to 100 at the start; the dashed line is inflation (break-even).
What This Market Follows
Specialty-car prices don't move in a vacuum. These economic indicators have historically led this market — tap one to see it shifted forward by its lead time, overlaid on the value line.
Case-Shiller National Home Price leads by about 16 months (moves with this market, correlation 0.79). Shown shifted forward 16 months so its turns line up with the market's.
Why We Think This
Current Inventory Snapshot
Comparable Markets
| Market | Undervaluation | Appreciation | Liquidity |
|---|---|---|---|
| Alfa Romeo 105 Sedan | 93 | 93 | 17 |
| Mercedes-Benz 190SL | 38 | 43 | 39 |
| BMW 2002 tii | 46 | 74 | 20 |
| Datsun 240Z | 41 | 56 | 38 |
| Datsun 280Z | 32 | 66 | 60 |
| Ferrari 308 | 38 | 64 | 34 |
| Ferrari 308 GT4 | 51 | 54 | 26 |
| Ferrari 328 | 58 | 46 | 42 |
Recent Signals & Alerts
- vin returned higher VIN relisted +$18,000 vs prior
- vin returned higher VIN relisted +$18,000 vs prior
- vin returned higher VIN relisted +$5,000 vs prior
- vin returned lower VIN relisted $-43,660 vs prior
- vin returned higher VIN relisted +$18,000 vs prior
- vin returned lower VIN relisted $-43,660 vs prior
Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.