Tatam was a motorcycle produced from 1955 to circa 1968, by Martin 'Spud' Tatam.
Tatam was one of the first to build grass-track machines in the speedway style using JAP engines. For grass he added a gearbox and brakes, but in other respects the speedway format was well suited to the grass circuits of the time.
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