Hard to read the plate but is that a Field Marshall..? If it is then it was produced by Marshall Sons & Co of Gainsborough. Their main product was agricultural tractors but I can't say I've ever seen a tracked version before. According to Wiki the tracked versions were actually converted at Fowler's of Leeds (aka the Steam Plough Works). That must have been before Fowlers started producing their own line of crawler t
Discuss this in the forum topic Monkey's day off the leash..