So I was sitting here at work, killing time and browsing about stones here in Japan, and I found...A LOCAL HONE MINE!
There's apparently a mountain that provided hones in a city called Iwakuni, about an hour from here. I found a blog showing pictures and evaluating a stone he PICKED UP there!

Check pictures here:
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and
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It's apparently a finisher, but who knows...

Holy crap is this exciting!!!