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Firth were motorcycles produced circa 1910 by Arthur Firth of Cleckheaton, Yorkshire.
It is probable that a few machines were built for friends, as a series of engines were offered from 2hp moiv to 6hp V-twin, and he also supplied many other components.
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X