There are two sets of serial numbers BECAUSE...the FARMALL 400 was considered a SEPARATE and DIFFERENT tractor than the INTERNATIONAL 400.
Therefore...the sequence of serial numbers that begins in 1954 applies ONLY to FARMALL 400's. Like the I- and W-series tractors that came before them were considered separate tractors from the H and the M, the (Wheatland)INTERNATIONAL 400's were considered a separate tractor from the FARMALL 400. So the International 400 got its own beginning serial number of 501, because to IH, it was a separate series from the FARMALL 400.
I don't know how I could explain it any more clearly. If your tractor is a Wheatland 400, you look up the serial number as an INTERNATIONAL. If your tractor is a FARMALL 400, you look up the serial number as a FARMALL.
Look, I'm not trying to get into a wizzin' contest here; I'm just trying to help. I apologize if I haven't helped you understand the difference. Maybe someone else can succeed where I apparently failed.
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