Serial number stamped into the flange where the engine and transmission meet on the left side of the tractor.
BELT PULLEY
RP
1220
Spee
2556ft/min / 779.07 meters/min
About Allis Chalmers Tractor
The D12 model tractor is one of Allis Chalmers's 9R line of tractors. The D12 is a Row-Crop Tractors type, which is used mostly in Agriculture Tractors. The D12 tractor features a engine. This setup is more practical in the real world.