Great points!
How about another kink in the Carborundum works? Sometimes the stone changed while the model number remained the same. Here's a few pages from a 1903 Carborundum Company Catalog listing the 201 as a two-grit potter's cutter, separate from the razor hones. However, the 201 becomes a two-grit razor hone later. The sizes are different too. The early 201 potter's cutter is 6x2-1/2 while the later 201 razor hone is 4x1-7/8. Fun stuff. =)
Oh, and it looks like they experimented a little with the numbers too. I've found original advertisements for the 103, 103A, 103C, and 103G razor hones. I wonder what might be all the differences. (Wouldn't it be fun to collect them all?)
Me