International Model 'T-6' agricultural tractor on tracks, wide tread, by the International Harvester Corporation, Chicago, Illinois, USA, Serial No. TBK 13050 T3, c. 1939. Engine: Serial No. TBKM 4414, 4-cylinder overhead valve gasoline(petrol)/ kerosene. International Model 'T-6' agricultural tractor on tracks 1934-1944