Got home and took a look under the 30x stereoscope. The 8000 is little used and is still shiny. The 1200 is well used and has some bits ripped out of the diamond and nickel plating. No doubt from the lapping. Still works as a bevel setter so I caught it in time. I checked my 325 and it looks fine and I have lapped many hones with it. Always under running water so I guess that helps. Sorry I can't help you with the difference between yours Sham.