What do I have? I purchased a David Brown 990 to farm 10-15 acres in industrial hemp. It replaces a 1953 Ford Jubilee. I believe it to be a very sound machine and capable of doing the job, but I am not sure exactly what model it is or if it has been altered. The tractor serial number is H990 UA 471597 and the engine serial number is AD4/47A 52985. It looks to be a late 1964 or early 1965 David Brown Implematic, with a 6 speed Hi-Lo transmission, however the hood and paint colors look like the David Brown Selectamatic made in 1965; white hood and brown/bronze engine frame. Did David brown use an updated hood and paint scheme on later Implematics or has someone replaced the hood and repainted?