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An adze is a wood working(timber) tool.
A "Sen" I believe, is a stone chisel used in Jnat processing by hand. Typically a narrow one at that, to help the stone lay flatter.
I have only ever seen them on Jnats.
OK - so is there an English word for a sen? Or are you saying that was never used outside of Japan? I took a geology course back in undergrad days and the prof had and used what he called an adze which left those same scalloped cuts in the stone.
My question on this topic of quarried stones finished with sen or adze-like tools was not seeking out any new stones or just to look at cuts. I was just curious if any quarried hones (old ones really) other than jnats had these scalloped cuts. I’ve personally never noticed them on anything other than jnats before now. That stone I posted pictures of is a PDSO and seems to me to have the same type cuts. Agree? Disagree?
I find it pretty interesting because that is a strong identifying mark if absolutely only on jnats and maybe PDSO. Or if it is completely unclear where the PDSO came from, is it possibly of Japanese origin? Or mining techniques and this Sen borrowed from Japan?