The Rockson was produced in Cradley Heath, Staffordshire, from 1920 to 1923, by a well-established iron and steel firm run by the brothers Sim, Cliff, Harry and Arthur Rock.
1922 They added 348cc and 499cc Blackburne sv engines with three-speed Burman gearboxes.
1923 It is thought that the factory had produced some 400 machines by that time and that half of them were exported to India. Although the motorcycles were reliable and well-finished, production came to an end.
Models:
An example of the Model C with a Blackburne engine is on display at the Black Country Living Museum
Sources:
History Website UK
Graces Guide
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