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On ebay right now there are listings with stones marked 'washita' that correspond to each one you have there and I don't think the sellers are mistaken. I have had them that looked just like the...

I'll third it. If you go to ebay and do a search for 'washita oilstone' you'll find quite a few mottled examples. Back in the '70s/80s I had an old Buck, and an old Smith's IIRC that were very dark...