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Lot 357: c.1922 Sunbeam 3.5hp

Collectors' Motorcycles, Bonhams (16 October 2005)

Already established as makers of high-quality bicycles, the firm of John Marston Ltd, of Wolverhampton, introduced the first Sunbeam motorcycle, a 350cc sidevalve single, in 1912. The marque quickly established a reputation for sporting prowess, achieving second place in the 1914 Isle of Man Senior TT and winning the 1920 race. Overhead-valve engines were introduced in the mid-1920s, but early successes were achieved with sidevalve machines, most notably the 492cc ‘long-stroke’ that secured a debut win at the 1921 French Grand Prix. In road-going form this engine remained in production right up until WW2. A 1923-season model featuring the new belt-rim brakes and sliding pinion gearbox, this incomplete sidevalve Sunbeam ‘flat tanker’ is offered for restoration. There are no documents with this machine.

Lot Details
Auction Collectors' Motorcycles
Bonhams, Classic & Motorcycle Mechanics Show, Stafford
TypeMotorcycle
Lot Number357
Estimate£1500-£2000
Outcome SOLD
Hammer Price£2500
Hammer Price (inc premium)£2875
Year
Condition rating
Registration number
Mileage-
Chassis number
Engine number12309
Engine capacity (cc)
Engine - cylinders
Number of doors