Ha, that's why I made my list from whatever Nakaoka-san had listed on ebay
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Ha, that's why I made my list from whatever Nakaoka-san had listed on ebay
Well even though normally its impossible to tell stuff just by pictures, I think its safe even for me to say, that those would be far too coarse. Several look man made, the yellowish looking one looks similar to a 500grit one I have seen, not sure about the smaller ones, it is possible they could be Nagura.
The fact one is on a wooden board means jack really, lots of natural hones ranging from real coarse, enough to remove chips from a kitchen knife fast, all the way up to high quality razor hones. I even have a man made hone with a wooden base. :)
Good luck for a flea market find, Spendy-san. :D
Sometimes it helps to see what else is on the ground. Toishi with gardening tools- not such a good bet. Toishi with a stethoscope -take a look.
I like the bit about sending him a stone for reference.