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LOT 221

The David Plant Collection, 1925 Sunbeam Model 3/4 Project (see text)

Sold for £1,408 inc. premiumLot to be sold without reserve
Lot 221

The David Plant Collection, 1925 Sunbeam Model 3/4 Project (see text)

The David Plant Collection, 1925 Sunbeam Model 3/4 Project (see text)

Registration no. not registered
Frame no. 17900
Engine no. 245/16243/S
Gearbox no. BT8616

Already established as makers of high-quality bicycles, the Wolverhampton-based firm of John Marston Ltd 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 famous 77x105.5mm 492cc 'Longstroke' that secured a debut win at the 1921 French Grand Prix in the hands of Alec Bennett. In road-going form this remarkable engine remained in production right up until WW2. Manufactured under a variety of model names, the Longstroke had gained drum brakes by the mid-1920s.

At time of cataloguing it had not been possible positively to identify this Sunbeam, though we are advised by The Marston Sunbeam Club and Register that it is either a 1925 Model 3 or 4 based on the frame number. The machine is offered as an incomplete restoration project and is sold strictly as viewed.

Condition and completeness unknown, Prospective purchasers should satisfy themselves with regard to this motorcycle's completeness, history, authenticity, originality and mechanical condition prior to bidding.

Footnotes

BUYER'S PREMIUM
The Buyer's Premium for this Lot is 28%+VAT on the first £40k of the Hammer Price, then 27%+VAT up to £800k, then 21%+VAT up to £4.5M and 14.5%+VAT thereafter.

All lots are sold 'as is/where is' and Bidders must satisfy themselves as to the provenance, condition, age, completeness and originality prior to bidding.

CONDITIONS OF SALE, AUCTION INFORMATION & GUIDE FOR BUYERS
Please see the 'CONDITIONS OF SALE, AUCTION INFORMATION & GUIDE FOR BUYERS' at the top of the main sale page (Motorcycles Online - The Summer Sale) for all pertinent information regarding bidder's obligations, viewing, bidding, payment, post-sale collection & transportation.

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  • 10 June 2026, 09:00 - 17:00 BST
  • 11 June 2026, 09:00 - 17:00 BST

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