From a picture view it appears to be a Cub. The ignition coil is not OEM and early ones were positive ground, I don't know when they switched to neg. ground. The S/N shows it to be a 1958 model going on my data book, with a C60 engine and just under 9 drawbar horsepower.
I think they were great tractors. When I was much younger in the 60s my neighbor had one for many many years and it was a white one which puts it at the early 50s model. Our other neighbor used it too and together they also leased a 5 acre parcel. Between their leased acreage and their own that tractor worked over 8 acres plowing, discing, harrowing, and cultivating year after year with no break downs I knew of . I just saw it working every year until 1971 when the Navy came calling.
Check in with Red Power. Those guys can have the real details and parts sources.