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Agreed, Randy. It is a complex subject & one that can be made even moreso by a pedant like myself :) I like the KISS principle but often forget to apply it.

Don't know re abrasive grain count...

Randy, with respect, that would make sense on the 1k sandpaper being more aggressive as it's closer to 600 grit if you convert the rating system to match the 1k Japanese rated stones but wet'ndri...

The coticule is a stellar example of this. I think the fact that vintage razors & even most new ones are generally made of a standard high carbon steel or stainless makes this an easy marriage....

Basically there is a concept of "marrying" the steel to the right stone" but most of the time whatever you have on hand will do. The times it does'nt you have to try something else.