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 309'734
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 1.5 migration guard limits unsupported downward changes to 3 points and weak-intrinsic-coverage upward changes to 5 points during the September 2026 transition window. Evidence-backed halo sanity floors require all three structural factors to be covered.
• 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 309'734
pending
Launch MSRP
US$ 2'995 ≈ CHF 2'453
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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Some research modules are temporarily unavailable; the affected sections remain explicitly incomplete: marketDepth, sci, advanced.
Market intelligence
At a glance.
How to read this
Only qualified SCC evidence is shown. Missing evidence stays blank.
Market depth pending.
Price distribution pending.
Value since MSRP
Launch · 1954
$2,995
Current research
$378,178
Qualified change
+12527.0%
SCI factor profile
Score & evidence.
SCI evidence pending.
Market signals
Market Radar.
Market signals pending.
Mileage impact
Mileage & value.
No mileage-tagged market evidence yet.
Global Registry
Known cars. Verified only.
3
Identities
0
Verified
—
Coverage
0
Mapped
Registry coverage
3 in review—
research
0.0%
verified
Method
Identity, verification and location are separate. Historical observations do not prove a current location.
Geography
privacy threshold · 3+No verified public geography yet.
Transaction tape
Recent observed sales.
Research depth
Sources & methodology.
Professional research stays complete, but it no longer competes with the first-read vehicle story.
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence
Evidence ledger.
Launch MSRP, realized sales, public asking inventory and valuation guides stay separate. Auction venue, mileage, model year and listing specification are exposed where the source publishes them. Source currencies are preserved and never relabelled as transaction prices.
Manufacturer / launch MSRP
Original published launch pricing. Net/gross basis is preserved where the source states it.
Completed sales
Published realized transactions only. Auction, venue, mileage and specification context remain visible; unsold bids never enter this group.
2026-08-07
Bring a Trailer
1958 · United States · 99,000 mi · Bring a Trailer · Online Auction · HAMMER
US$ 215'000 ≈ CHF 176'089
2026-07-01
Bring a Trailer
1958 · United States · 417 mi · Bring a Trailer · Online Auction · HAMMER
US$ 400'000 ≈ CHF 327'607
2026-06-15
Bring a Trailer
1958 · United States · 2,200 mi · Bring a Trailer · Online Auction · HAMMER
US$ 356'356 ≈ CHF 291'862
2025-09-16
Bring a Trailer
1958 · United States · 409 mi · Bring a Trailer · Online Auction · HAMMER
US$ 400'000 ≈ CHF 327'607
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 · 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 · 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 · 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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