So I got a new Japanese Natural from my barber today...it's enormous, in my opinion...20.5cmx7.3cmx3.6 (8.1x2.9x1.4 in inches). It's like a brick...and it is so pretty.
When I got it, it was a testament to how far a barber can take a stone without lapping. There was a groove a good 2mm deep, in just the right width to fit the head of a kamisori...he had worn it down over YEARS of sharpening Japanese razors on it, I reckon...judging by the fact that it took me over an hour of lapping with a 400 grit diamond plate to get past it, it's not a particularly soft hone.
It looks like a Kiita with Nashiji to me, but that's just from looking at the pictures around here.
Here are some pics, pre and post lap.