Weaverame:
Any Cub with a chassis serial number 700,001 or greater is CCC/MTD built.
On the Kohler, if the spec numbers are:
24,000 to 24,299 = Series I
24,300 & up = Series II
Like AJ mentioned, those guidelines are accurate.
The IH emblem was just a part that was used on the tractor. I have a 1984 784 that has IH signage all over it also.