After WWII, David Brown improved the VAK1 tractor, calling it the VAK 1A, built from 1945-1947, until it was finally became the David Brown VAK 1C, Cropmaster in 1947, with all the VAK 1's problems ironed out. The David Brown Cropmaster was made between 1947 and 1954, and nearly 60,000 of these were made. The petrol/TVO Cropmaster produced 35bhp, but in 1949, David Brown started making the diesel that was slightly more powerful, at 31.5bhp. The Cropmaster is capable of nearly 18mph in top gear.
Ref: Farm Classics, Volume One. David Brown Tractors 1936-1964 by Alan Earnshaw
This vintage David Brown Cropmaster VAK 1C tractor was fully restored 5 years ago and runs well. First registration was in January 1952. She is Petrol/TVO. I have taken it ploughing at a local vintage tractor working day last September and had a great time, the tractor didn't miss a beat, and coped very well with a David Brown two furrow plough. This Cropmaster is ideal for tractor runs, as it has two seats, so you can take a friend. This David Brown is registered on the road, and has a current tax disc.
This Cropmaster registration number is GTH 729 Engine Serial No AK4/3/321 P39670