Got my approximately 8 in x 2 in Mikawa botan nagura from Takeshi. Didnt lap yet, but feels nice on the blade. I have to lap it smooth though to get a real feel for it. Scratch pattern as it is now (surface is smooth) is similar to a striped iyoto I have. Nice gritty, not sticky and the swarf built up rather quickly. Will give it a whirl this weekend and see after lapping. I can retain the stamp as both side are equally smooth and flat and will seal three sides and bottom.