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Well, after cleaning them some they are very uniform in color and don't really have any of the character you normally see in natural stones. They do feel smooth though so I guess one is a finisher...

Looks like it is Moline, IL

Found these two hones but don't know what they are.
The makers mark became more clear on the dark stone (hard ark?) after cleaning.
Since they are American made my first guess is that they are...