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Royal Ajax were motorcycles produced by the Silver Queen Cycle Co of Gray's Inn Road, London, between 1904 and 1906.
The machine was a typical primitive fitted with a 2.5hp engine, upright in a cradle within the frame. It had belt drive and rigid forks and was probably an Alldays and Onions model with a different tank transfer.
It was only listed until 1906 and nothing more was heard of it.
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