It's kind of hard to tell from the pictures, but it looks like the lift pins on that 3ph are straight across, on the same plane.
Yes you are correct. The right side lift pin is normally lower than the left side, but in this case they are on the same level. I noticed that for the first time while I was cleaning and painting the plow. I went on this morning (Wednesday July 18th) and took it to the rear of our property and plowed a small section. It did a good job of plowing. The fact that the lift pins were both on the same level did not seem to affect how it plowed.
I haven't a clue as to the make of the plow, but it's not a JD and the first thought that came to mind when I saw the green in the first photo was, it's maybe Oliver?
Did Oliver have a two point hitch setup? As others have mentioned this old plow was not originally a three point connection plow.
This old plow seems to have good metal in it. The plow points do not show any wear to speak of. I am happy with it.