Those could be replacements, possibly forged by a blacksmith.
That is an odd IH logo. Almost looks laser-engraved. Never seen one like it. Normally the plow would have the old-timey IHC logo.
One theory that comes to mind is, this is a P&O plow built around the time IH bought the P&O company. The oddball IH stamp could just be IH "marking its territory" on plows already in inventory.
The IHC logo would presumably be stamped into the forgings while they were still hot. That would be a production change.
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