Here is a scan of one of the pieces of literature for the 450 plow. This piece is dated 2-65. Looks like it is behind a 1950 probably a MFWD. These plows were sold to customers that had tractors without three point hitches, we called them "self-propelled drawbars". The 500 series semi-mount plows pulled much esier simply because they were closer to the tractor and out sold the pull-types by hundreds of times.
The onland plows were a problem if the size and power source didn't match. The line of draft is a straight line from 1/2 the width of cut + 1/4 of one bottom towards the unplowed land. This line needs to be as paralled to the previous furrow as possible. In the plow in the literature, this would be #5 bottom, 3/4 of the way from the unplowed land. In your photo it looks like the hitch is in the correct place. Now when you reduce the number of bottoms the tractor gets closer to the furrow and if it has dual wheels the outter dual is too close to the furrow or fallin into it. Most guys would adjust the hitch to the left to get the wheels away from the furrow and now you are pulling the plow sideways making all kinds of problems. Had guys trying to pull a 5 or 6 bottom with dual wheels and the hitch way out of the line of draft and have been screamed at!
Looks like you have found a good plow with disc jointers. Good luck with your find.
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