St. George's Motorcycle Co
SGM, (from the initials of St. George's Motorcycle Co of Birmingham) was a motorcycle produced in 1919.
This was an early post-World War I machine fitted with a 634cc Norton Big Four engine and three-speed Sturmey-Archer gearbox with belt final-drive. The long wheelbase frame had sprung forks.
Sources of Information
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