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1970s Triumph Bonneville T120 (650 cc) Valuation Report

Date: September 2025

Historical Overview

The Triumph Bonneville T120 650 cc was an icon of the 1970s British motorcycle scene, continuing the legacy of the 1960s model. With twin-carb performance, distinctive styling and export popularity, the T120 was a favourite in both the UK and the US. By the mid-1970s it was eventually replaced by the 750 cc T140, but today the 650 T120 remains one of the most desirable Triumph twins of the period.

UK Valuation Summary (by condition)

Condition	Estimated Value (GBP)	Example External Source (plain text)
Project / Restoration Non-running, incomplete, or requiring major recommission.	£3,500 – £5,000	eBay UK — 1970s T120 project sales £3.8–4.5k (2024–25). Car & Classic — occasional restoration candidates £4–5k.
Roadworthy / Presentable Running, MOT’d examples; tidy but showing age-related wear.	£6,000 – £8,500	Iconic Auctioneers — 1971 Bonneville T120 sold £7,475 (Oct 2023). Car & Classic listings typically £6.5–8k.
Restored / Excellent Concours-level restoration or very original low-mileage survivor.	£9,000 – £12,000	Bonhams Stafford — 1970 Bonneville T120 sold £10,925 (Apr 2024). Dealer asks in 2025 up to £12k for top restored examples.

Notes: Values vary depending on whether the bike is an early 1970–71 T120 or a later 1972–73 example, as later models are overshadowed by the 750 cc T140. Export-spec and matching-numbers examples are strongest. Original paint and chrome are key value drivers.

Value Influencing Factors

Originality: Matching engine/frame, correct paint, seat and mudguards matter significantly.
Model year: Early 1970–71 models generally fetch stronger prices.
Mechanical health: Engine rebuilds, electrics and gearbox condition drive costs and value.
Documentation: UK history, V5C, MOTs and invoices improve desirability.
Market timing: Stafford and NEC auctions set the tone; spring/summer sales strongest.

Conclusion

As of September 2025, UK 1970s Triumph Bonneville T120 650 cc values generally sit around £3.5–5k for projects, £6–8.5k for tidy roadworthy riders, and £9–12k for restored or exceptional originals. Matching numbers and originality remain the strongest price drivers.

Sources (plain text):
eBay UK — project T120s sold £3.8–4.5k (2024–25).
Car & Classic — UK listings £6–8k; projects £4–5k.
Iconic Auctioneers — 1971 Bonneville T120 sold £7,475 (Oct 2023).
Bonhams Stafford — 1970 Bonneville T120 sold £10,925 (Apr 2024).
Dealer asks 2025 up to £12k for restored examples.

All Valuations