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He never mentioned it, but it must have been him or his source. I put little rubber feet on the bottom of the wood for stability...

Here's a pic of my two from Old School. I hope you can see the colors in the photo, it doesn't really do them justice. They really don't look blue gray in person..
The larger one is a Nakayama...

Hmmm, My Asagi, I have several, all different colors, One is a Nakayama Maruichi Asagi with the Maruka stamp as well, it's more of light brown color, I can post pics later when I'm more...

I have several jnats, two almost identical to yours. A former mod here used to sell them, and had descriptions of the Kanji on his site, but it is in fact down now. I did wind up lapping one of mine,...