1964 Triumph 6T Thunderbird 650cc Project Valuation Report

1964 Triumph 6T Thunderbird 650cc Project – Ref D1200

Date: August 2025

Historical Overview

The Triumph 6T Thunderbird 650cc, produced between 1960 and 1966, was developed to increase appeal in the U.S. market with a bored-out Speed Twin engine. Delivering around 34bhp, the Thunderbird offered touring performance and distinctive style, cementing its place in British motorcycling lore.

Valuation Analysis

Below are UK condition-based valuations derived from recent auction outcomes and market listings:

Project Condition: ~£2,300–£3,000
Example: Project Ref D1200 listed for £2,450, engine turns over but non-running, likely requires recommissioning. (Source)
Running but Still a Project: ~£3,500–£4,500
Running bikes needing mechanical or cosmetic work still fall within project-tier pricing.
Roadworthy Condition: ~£4,500–£6,000
A 1964 Thunderbird sold at auction in July 2018 for £5,738 described as “very good all round” but in need of minor recommissioning. (View Result)
Restored / Mint Condition: ~£5,000–£5,500
A restored 1964 Thunderbird estimated at £5,000–£5,500 at an April 2024 auction. (View Listing)

Factors Influencing Value

Matching Frame & Engine Numbers: Adds premium appeal.
Running Status: Starts & turns over vs fully roadworthy changes classification.
Documentation & Registration: UK V5C increases buyer confidence and value.
Condition of Major Systems: Recommissioning needs, brakes, electrics and cosmetics impact price.

Conclusion

The 1964 Triumph 6T Thunderbird remains a highly desirable classic. Project-level bikes still fetch decent figures thanks to collector interest. For Ref D1200, the current asking price of £2,450 places it firmly in the project range. If recommissioned to a running state, it could move into higher tiers. Fully restored examples are valued in the £5,000–£5,500 band.

All Valuations