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I suspect the poorly honed razors we so commonly see also give us a hint of the use of barbers hones. When we see a razor with the tip about 1/4 inch narrower than the heel, or a vicious frown, or...

There are a lot of barbers hones for sale on Ebay. Judging from that, I would guess that many non-barbers used them.

Anecdotally, when I started using straight razors a Swaty was waiting for me...