When they were red, the only parts that were green were the wheels. They did make them green with red wheels as well, so maybe someone had to get parts and Oliver supplied them with green ones.

Almost everything was red on the plow, with the green wheels and yellow lettering. The wear faces of the bottoms were originally coated with something that was mostly transparent, so those parts were metallic in appearance. I still have some NOS shares with this coating on them.

They made the Plowmaster 100 for a long time, during the 1940s and 1950s, so saying what year it is would be tough. Since it has the red frame, I would say older than 1952 at least.