Sam: I'm going to argue with myself. Too new for an H or M 2 way plow, any I've seen had PO part numbers. The 189 Super A plow left beam part number is 512503 R1. The 1-F-11 one point fast hitch two way plow has a left beam part number 521497 R1. This leads me to believe your plow, having a part number 515801 R1 in between the two, falls somewhere in the 1950s.
There are a few items I don't have in my two books covering 65 plows. I don't have anything on a C or SC two way plow. H - M mounted two way plows ended production in late 1940s. I doubt if IH sold many after the war. The reason being, the No. 39 two way trailer plow comenced production in 1939, that probably ended the mounted plow production for H and M. Close as I can come with these books.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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