Collector signal
Porsche's Christophorus states that, in the 356 collector market, Speedsters rank behind only the four-cam Carrera variants and that authenticity is especially valuable.
Vehicle facts
Built
—
Research in progress
Powertrain
B4
Technical profile in progress
Output
75 PS / 55 kW
Existing catalog value
Verified market value
CHF 311'222
pending
About this car
SCI Collector Score, the collector case, essentials, market & analysis.
SCI Collector Score
SCI-1.5.062/100
Balanced · Balanced
SCI scale
Tap a color to explore the scale.
6/10
Current · 6/10 · Balanced zone
58
Evidence Confidence
70%
Coverage
Indicative SCIRisk —
SCI 1.5
Collector score.
75%
Collector core
25%
Market
Factor breakdown
Open any factor to see what it means and which evidence supports it.
How SCI works
Collector quality and evidence are separate. Structural collector factors carry 75%; observable market factors carry 25%.
Methodology & score historyResearch notes
Publication gates
• No coherent sold-price benchmark is available.
• Needs at least 5 comparable sold observations inside the 36-month market window.
• Needs at least two independent source providers in the benchmark window.
• Data Confidence must reach at least 68/100.
Rationale
• Source-backed current-market evidence sits +12527% versus the researched launch MSRP in the same currency.
• Collector Evidence G contributes source-backed structural evidence from 4 independent sources; it does not substitute for transaction evidence.
• SCI 1.5 separates structural collectibility from evidence confidence: scarcity, collector significance and future relevance carry 75% of SCI; observable market factors carry 25%. Thin public-market evidence primarily reduces Confidence rather than intrinsic collector quality.
• Uncovered factors retain conservative neutral priors in the score model while their missing support remains visible in factor coverage and Evidence Confidence; they are never presented as equally evidenced facts.
• SCI is indicative: the collector score clears the coverage gate, while Verified publication still requires the independent market-evidence gates.
Collector intelligence
Why it matters.
The collector case in a few signals first. Full editorial notes and source detail remain available below.
Rarity
No single Porsche primary source with a complete 1954-1958 Speedster production total was located in this batch.
Engineering
Year-specific auction counts (for example 1955 Pre-A) are not extrapolated to the whole row.
Rarity
Not a numbered limited series
Key checksVery high: Porsche's own collector commentary stresses authenticitycorrect body, windscreen/top hardware, engine, interior and documented restoration history are therefore…
Technical profile
The essentials.
Engine architecture
B4
Power
75 PS / 55 kW
Cylinders
4
View all specifications
Engine architectureB4
Cylinders4
Power75 PS / 55 kW
Kerb weight850 kg
Market
What the market tells us.
A quick read of the strongest published price evidence. Original source currencies stay preserved.
Verified market value
CHF 311'222
pending
Launch MSRP
US$ 2'995 ≈ CHF 2'465
United States · 1954
Market confidence
58/100
Low
Evidence activity
4 sold
3 asking · 1 source
Market chart & benchmark
Price history, evidence modes, ranges and benchmark methodology · open by default
OpenClose
Market chart & benchmark
Price history, evidence modes, ranges and benchmark methodology · open by default
Collectible market terminal
Market benchmark researching
Porsche 356 Speedster · model-level research benchmark, not an appraisal of a specific chassis.
Completed sales · 4 · chart-readyAsking market · 3
Raw sales + adaptive trend · historical FX display layer · SCI benchmark gates remain unchanged
4 Sales3 Ask0 GuidesFX normalized
Observed sold-price evidence. Original source currencies remain preserved.
4 trend-eligible sales · launch visually anchored · 4 historical-FX pointsMove across a sale point to inspect the observation
SaleAskMedian trendLaunch MSRP
Raw sales remain individual evidence points. The filled line is an adaptive median market story visually anchored to launch MSRP on MAX; launch is not included in the median, SCI score or benchmark eligibility.
SCI Research Tools
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Vehicle gallery
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Market intelligence
At a glance.
How to read this
Only qualified SCC evidence is shown. Missing evidence stays blank.
3
Active asks
0
New · 30D
0d
Median duration
4
Verified sales
Price distribution · USD
Asks, guides & verified sales.
7 observations
AsksSales
SCC $378,178
$215,000$409,860
Value since MSRP
Launch · 1954
$2,995
Current research
$378,178
Qualified change
+12527.0%
SCI factor profile
Score & evidence.
SCI 62
70.0%
coverage
58
Confidence
4
Comparable sales
Scarcity50 · pending
Collector significance67 · covered
Future relevance64 · covered
Historical performance50 · pending
Demand & momentum90 · covered
Liquidity78 · covered
Price resilience75 · covered
Supply dynamics45 · covered
Methodology details
SCI and evidence confidence remain separate measures. Missing evidence is never presented as equal precision.
Market signals
Market Radar.
Evidence currently in scope
4 qualified completed sales · 0 qualified active asks · 1 source families · FX-normalized to USD
1/4 published
Mileage impact
Mileage & value.
Reference sale value
$378,178
4 qualified sales with exact mileage
Reference mileage
2,106 km
Exact sale evidence
Curve status
Research
More comparable sales needed
SourceMileageValueDate
Bring a Trailersale409 mi$400,0002025-09-16Bring a Trailersale2,200 mi$356,3562026-06-15Bring a Trailersale417 mi$400,0002026-07-01Bring a Trailersale99,000 mi$215,0002026-08-07AutoScout24 Switzerlandask6,300 kmCHF 330,0002026-08-27AutoScout24 Switzerlandask17,150 kmCHF 299,5002026-08-27AutoScout24 Switzerlandask1,000 kmCHF 320,0002026-08-27Upper-bound mileage stays qualified; asking values do not enter the sale-based curve.
Global Registry
Publicly observed.
Source-backed historical observations, deduplicated into known identities where evidence is strong enough. This is provenance research, not live tracking.
3
Publicly observed
4
Public observations
Aug 2026
Latest evidence
—
Research coverage
Research coverage
—
observed
Public source geography
One map · filter registry, sightings and listings
Public aggregates and attributed historical reports · historical evidence, not live tracking
Historical evidence · not live
3/3 mapped
Loading evidence map
Selected country
United States
North America · privacy-safe aggregate
3/ 3
identified here
3
recent evidence
100%
mapped share
public country cellno evidence in layer
Natural Earth basemap.Transaction tape
Recent observed sales.
Research depth
Sources & methodology.
Professional research stays complete, but it no longer competes with the first-read vehicle story.
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence
Evidence ledger.
Launch MSRP, realized sales, public asking inventory, valuation guides and reported one-off commission estimates stay separate. Auction venue, mileage, model year and specification context are exposed where sources publish them. Source currencies are preserved and estimates are never relabelled as MSRP, transactions or current market value.
Manufacturer / launch MSRP
Original published launch pricing. Net/gross basis is preserved where the source states it.
Completed sales
Published realized transactions only. Auction, venue, mileage and specification context remain visible; unsold bids never enter this group.
2026-08-07
Bring a Trailer
1958 · United States · 99,000 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 215'000 ≈ CHF 176'934
2026-07-01
Bring a Trailer
1958 · United States · 417 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 400'000 ≈ CHF 329'180
2026-06-15
Bring a Trailer
1958 · United States · 2,200 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 356'356 ≈ CHF 293'263
2025-09-16
Bring a Trailer
1958 · United States · 409 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 400'000 ≈ CHF 329'180
Current asking inventory
Public dealer and marketplace asking evidence as last verified. An asking price is inventory evidence, not a completed transaction.
2026-08-27
AutoScout24 Switzerland
Switzerland · 6,300 km · PHYSICAL ASK · Asking Price
356 Speedster AT 1; exceptional condition · Centre Service Porsche Neuchâtel · seller_type=DEALER · Marin-Epagnier · Tax: UNKNOWN
CHF 330'000
2026-08-27
AutoScout24 Switzerland
Switzerland · 17,150 km · PHYSICAL ASK · Asking Price
356 A Speedster T1; 75 PS; engine not matching · Porsche Zentrum Zürich · seller_type=DEALER · Schlieren · Tax: UNKNOWN
CHF 299'500
2026-08-27
AutoScout24 Switzerland
Switzerland · 1,000 km · PHYSICAL ASK · Asking Price
356 Speedster; total restoration; matching numbers; Porsche certification · Promocar classic · seller_type=DEALER · Agno · Tax: UNKNOWN
CHF 320'000
Collector research notes
Full narrative, value drivers and risk factors
Collector research notes
Full narrative, value drivers and risk factors
Porsche's Christophorus states that, in the 356 collector market, Speedsters rank behind only the four-cam Carrera variants and that authenticity is especially valuable.
Potential value drivers
- • No single Porsche primary source with a complete 1954-1958 Speedster production total was located in this batch. Year-specific auction counts (for example 1955 Pre-A) are not extrapolated to the whole row.
- • Not a numbered limited series
- • conceived as a simpler, lower-priced, lightweight/open 356 derivative for the US market at Max Hoffman's request.
- • An iconic 356 body style with exceptional collector standing, though Porsche's own Christophorus market commentary places four-cam Carrera variants above the Speedster within the 356 hierarchy.
- • Value came from simplification and low weight rather than a unique high-output powertrain: low windscreen, minimal weather equipment and stripped interior created a focused lightweight road car.
- • Created largely in response to US importer Max Hoffman's market insight and became one of the most enduring Porsche body-style identities.
Risk factors
- • Very high: Porsche's own collector commentary stresses authenticity
- • correct body, windscreen/top hardware, engine, interior and documented restoration history are therefore critical.
- • Re-bodied or incorrectly restored cars, non-original engines, converted Cabriolets and mixed Pre-A/A specifications can undermine identity. Exact chassis/body/engine documentation should precede valuation.
Research status & production source
Verification, research tier, methodology and factory source
Research status & production source
Verification, research tier, methodology and factory source
Research status
Static profile
Editorial review in progress
Production facts
Verification pending
SCI methodology
Research · confidence 58/100
Research tier: P1 · Core research
Last static verification: 2026-08-31T00:00:00+00:00
Production source
Researching
Exact production research remains open.
Continue research
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