THE VEHICLE AT A GLANCE
Model dossier
- Manufacturer
- Alfa Romeo
- Base model
- 6C 2500 S Spider
- Coachbuilt version
- Legacy 1950 Castagna Spider identity; S/SS body-period conflict unresolved
- Coachbuilder
- Castagna
- Production period
- 1950
- Body style
- Spider
- Engine
- Inline-6
- Type
- Limited
- Production
- 1
THE PEOPLE BEHIND THE CAR
Coachbuilding, design & conversions
PRICE & SALES RECORD
Vehicle value
- Original price
- Not documented
- Latest recorded sale
- Not documented
01 / THE STORY
History & context
The Alfa Romeo 6C 2500 S Spider (1950) was coachbuilt by Castagna and designed by Giuseppe Seregni. Developed in the post-World War II era, the 6C 2500 S Spider represents a significant evolution within Alfa Romeo’s lineup, reflecting the resurgence of Italian coachbuilding and luxury automotive design. The car was constructed with a focus on streamlined proportions and elegant styling, typical of the era’s automotive aesthetics.
The coachbuilding process involved meticulous craftsmanship, integrating advanced manufacturing techniques with traditional methods. The body design featured smooth lines and an aerodynamic profile, enhancing both aesthetics and performance. The construction was characterized by a lightweight design, which contributed to improved handling and agility.
Mechanically, the Alfa Romeo 6C 2500 S Spider was powered by an inline-six engine, providing a balance of performance and refinement. The mechanical configuration included a robust chassis paired with a sophisticated suspension system, designed to offer a smooth driving experience while maintaining road stability.
Production of the 6C 2500 S Spider was limited to a single unit, highlighting its exclusivity within the automotive market. Documentation indicates that this unique model has been preserved in excellent condition, with surviving examples recorded in private collections. It serves as an important reference for researchers of postwar coachbuilding, showcasing the collaboration between designer Giuseppe Seregni and coachbuilder Castagna.
Surviving examples are recorded in private collections and institutional archives, providing reference for researchers of postwar coachbuilding. The Alfa Romeo 6C 2500 S Spider stands as a testament to the artistry and engineering prowess of its time, encapsulating the spirit of Italian automotive innovation.
02 / TECHNICAL IDENTITY
Specifications & construction
Production & construction
- Production
- 1
- Production type
- Limited
- Production notes
- The 1000 Miglia eligibility reference places 6C 2500 SS Spider variants in 1947–49 and the 6C 2500 S Cabriolet Touring in 1950–52. This creates a body/series chronology conflict with the legacy '1950 6C 2500 S Spider Castagna' label. Preserve the route pending exact period evidence; Giuseppe Seregni remains candidate only and no count is inferred. NO_AUTO_INHERIT.
Engine & performance
- Engine configuration
- Inline-6
Design & manufacture
- Manufacturer · Documented
- Alfa Romeo
- Coachbuilder / Body Builder · Documented
- Castagna
- Designer · Candidate
- Giuseppe Seregni
06 / EVENTS & AWARDS
Events & awards
No events or documented awards are currently recorded for this vehicle.
07 / THE VEHICLE IN DETAIL
Photo gallery 1 photographs
08 / FROM THE ARCHIVE
Archive
References held in the vehicle dossier. Their inclusion does not establish that every historical claim has been independently verified.
| Reference | Source type |
|---|---|
| 1000 Miglia 2026 — List of eligible cars cdn.motor1.com | Event homologation reference |
| Stichting Club Alfa Romeo Bezitters — historical 6C 2500 catalogue discussion forum.alfaclub.nl | Specialist community historical catalogue |











THE CONVERSATION
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