British Challenge Cycle Co
From Graces Guide
British Challenge Cycle Co of Challenge Works, Foleshill Road, Coventry.
Also see Challenge Cycle Co
c1868 Company formed
Firstly produced bicycles and carrier cycles before starting to manufacture motorcycles with either two-stroke or four-stroke engines.
1919-20 Produced the Coventry Challenge motorcycle
1949 Winding up order 
Sources of Information
-  Gazette Issue 38556 published on the 8 March 1949. Page 34 of 62
- 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
- Coventry’s Motorcycle Heritage by Damien Kimberley. 2009. ISBN 978 0 7509 5125 8