That is definitely green. The picture I have is in black and white. Maybe Oliver built this plow longer than I thought. I went through some old pictures of my dad plowing, and he is using an older style plow with clutch lift, and it is all green, indicating it was made in the mid 1950s. I wouldn't have guessed they were making that plow at that time either. 

You might pick in those part number letters stamped in the frame and see if you can find red paint down in them, that would indicate a repaint at some point in its life. Otherwise, it looks like it is newer than I would have thought. If you go with green frame and red wheels, use the meadow green, and not the darker one, because I'm pretty sure they only used that paint scheme in the early 1950s, and possibly around 1957-58.