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1950s Triumph Thunderbird 6T Valuation Report

Date: August 2025

Historical Overview

The Triumph Thunderbird 6T was launched in 1949 as a 650cc parallel-twin designed for the US export market, but it quickly became popular in the UK. The model gained fame after being featured in the 1953 film The Wild One. Early 1950s models retained the headlamp nacelle and pre-unit engine layout, while later decade examples benefited from subtle frame and brake improvements. Known for smooth performance and classic Triumph styling, the Thunderbird remains a favourite among collectors.

UK Valuation Summary (by condition and year)

Condition	Early (1950–1954)	Later (1955–1959)	Example External Source (non-link reference)
Project / Restoration Non-runner or incomplete; typically missing tinware or original mudguards, may require full engine rebuild.	£4,500 – £6,500	£4,000 – £6,000	eBay UK sold listings; Car & Classic – completed adverts
Roadworthy / Presentable Usable and generally complete; may have older repaint or some non-original parts.	£7,500 – £10,500	£7,000 – £9,500	H&H Classics – auction results
Restored / Excellent High-quality restoration or very original survivor; correct paint schemes, matching numbers, and strong mechanical condition.	£12,000 – £15,000	£11,000 – £14,000	Bonhams – Stafford Sale; The Saleroom – multi-auction records

Notes: Early nacelle-equipped Thunderbirds often achieve higher prices due to styling desirability and early production rarity. Provenance, documented history, and correct period accessories (such as original Smiths speedometers and mudguards) also influence value.

Value Influencing Factors

• Model year: Early nacelle models tend to command higher prices.
• Originality: Matching numbers and original parts are valued more highly.
• Restoration quality: Professional restorations with correct paint and trim increase value.
• Provenance: Known history, especially export/import background, adds to appeal.
• Market timing: Spring and early summer sales yield the strongest results in the UK.

Conclusion

UK values for the 1950s Triumph Thunderbird 6T depend on year and condition. Early 1950–54 projects typically start around £4.5k, with roadworthy examples reaching £10.5k and restored bikes up to £15k. Later 1955–59 machines trade slightly lower, with top restored examples still capable of achieving over £14k when provenance and originality are strong.

All Valuations