Can anyone help me ID these two hones? Both are close to standard razor hone size and vintage. Both have been cleaned up and lapped flat. Both are very fine and quite aggressive cutting power. The first one has the feel of a Coti but produces a brown slurry. The second is some kind of super fine sandstone I think. The most dense and fine sandstone I've yet to see. The stone is lighter in color than what the pics show. My camera isn't the best. It's extremely hard and dense. Lapping it was a speed similar to a Coti but has that sandstone feel. Cuts very fast. At first glance I thought it was a Pierre Du Sud-Ouest but it seems way too hard for that. I'm puzzled on both of these.