✦ Shifty Estimate
$42,000
- 12 months median
- $17K
- Market cap
- $265.6M · 6,325 built
- Sales, 12 months
- 4
- Original MSRP
- $3,495 · ▲ 1102% since
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1966 Alfa Romeo Spider Duetto
1966 to 1969 · Roadster · 6,325 built
Price history
Recent sales
More sales on file
The full sale history lives in the app.
Every sale for this exact market, with the chassis behind each number. Drop your email and you are first in.
Specifications
- Engine
- DOHC Inline-4, 1.6L
- Power
- 109 hp
- Torque
- 103 lb-ft
- 0 to 60
- 11.3s
- Top speed
- 112 mph
- Transmission
- Manual
- Drivetrain
- RWD
- Curb weight
- 2,248 lb
- Production
- 6,325 units
- Original MSRP
- $3,495
- Designer
- Battista Pininfarina
Common questions
How much does a Alfa Romeo Spider Duetto cost?
A 1966 Alfa Romeo Spider Duetto cost $3,495 new. Over the past 12 months, 4 have sold publicly at a median of $17,000. The Shifty Estimate for a well-kept example is $42,000. Cars have changed hands anywhere from $15,041 to $48,300, depending on mileage, color, and history.
What is a 1966 Alfa Romeo Spider Duetto worth today?
The Shifty Estimate is $42,000. That sits above the $17,000 median of actual sales because the median counts every car that sold, including high-mileage examples, while the estimate describes a clean, low-mileage one bought today. We rate confidence medium: 4 public sales in a year is a thin market, and the spread between them is wide.
Is a Alfa Romeo Spider Duetto a good investment?
It has appreciated 1102% against its $3,495 list price. Only 6,325 were built. The caution is spread, not direction: across the sales we have on file, prices ran from $2,700 to $63,000, and mileage explains most of that.
What has a Alfa Romeo Spider Duetto sold for at auction?
The 3 most recent public sales we have on file:
- $2,700May 15, 2026Yellow · 91,000 mi
- $25,000May 14, 2026Red · 48,309 mi
- $40,000Sep 30, 2025Red · 44,000 mi
The Duetto launched Alfa's most enduring design, with Pininfarina's flowing lines remaining virtually unchanged for over two decades. The original 1.6-liter twin-cam produced 109 horsepower, providing spirited performance wrapped in timeless Italian elegance. With 6,325 built during the first generation, the Duetto established the archetypal Italian roadster formula. The distinctive 'boat-tail' rear end and perfect proportions make it the most desirable Spider variant among collectors. Graduate immortalized the design in popular culture, but the Duetto's appeal transcends Hollywood. Rust remains the primary concern, making solid examples increasingly valuable. Original cars with matching numbers and proper colors command strong prices. The Duetto represents the purest expression of Alfa's spider philosophy, combining mechanical excellence with Pininfarina's masterful styling.