All Red Hunter bikes have a distinctive dark red petrol and oil tanks. Handling was improved by the addition of rear suspension and telescopic forks and it gained an alloy cylinder head from the 1950s.
The machine also comes with an old-style V5 registration document and an RF60 logbook, the latter recording licensing from 1925 to 1929.'SP 1765' has been fitted with a replacement JAP engine dating from 1917, and was previously registered as a sidecar.
Noteworthy features include a Sturmey Archer gearbox, and a Lucas 'King of the Road' headlamp (detached).
A variety of two-stroke and four-stroke power units was specified, the lightweights all using the reliable Villiers two-stroke.
Manufacture of the Sparkbrook motorcycle ceased in 1925.
First two photos are of the JAP and third is the Ariel.