hones from 60's info. help?

these are a couple stones I got from an ex-barber they both have some kind of marking on them. I'm hopeing somebody can identify them, or atleast know more about them than i do

this first one is an olive drab color marked kansas school of barbering, and it's not very course
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Attachment 50414

the next one is grey and says a product by carborundum N0. 159 sic, this one is a bit more course than the first

Attachment 50415
Attachment 50416

any information would be appreciated.

The first is a barbers hone, Lynn has one just like it and can be seen in his video of barber hones. The second one I could not make out the numbers, but Ron/Utopian should be able to tell you.