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1961 Porsche 356 Cabriolet Prototype One-of-One Factory Build
This exceptional 1961 Porsche 356 Cabriolet is a confirmed non-production prototype a
singular example from the Porsche factory's research department. Verified by official
correspondence from Porsche AG, it was never offered for public sale and reflects a rare
instance of design experimentation at the end of the 356 era.
Why This Car Is Unique:
- Prototype Verification: Official Porsche documentation confirms this vehicle as a non-
series production prototype.
- First RHD T6 Cabriolet: Believed to be the first right-hand-drive (RHD) Type 6 (T6)

Cabriolet ever produced. While RHD 356s were sold commercially, their use in prototypes
was extremely rare, suggesting market testing for RHD countries.
- Chassis & Engine Numbers: Chassis 154961, Engine 085381 a pairing not found in
standard production batches.
- Stuttgart-Issued Factory Plate: Seen in factory photos with Stuttgart registration, common
for internal development vehicles.
- Custom Window Geometry: Subtle deviations in windshield rake and A-pillar shape
possibly tested for visibility, aerodynamics, or structural integrity.
- Convertible Body with T6 Styling: Includes teardrop tail lamps, chrome overriders, and
soft-top layout; shown in high-quality Porsche press imagery.
- Factory Documentation: Porsche's Press and PR department responded to an ownership
inquiry confirming its prototype status and internal use.
Historical Importance:
Developed as Porsche transitioned toward the 911, this 1961 Cabriolet prototype is one of
the last engineering experiments of the 356 lineage. It offers a rare glimpse into Porsche's
strategic planning and engineering curiosity during a pivotal time in automotive history.