Thanks so much to all for the feedback about this stone. I lapped it with a DMT 325 and used it without slurry to refresh the edge of my 6/8 Dovo Best. Absolutely loved the feel of this stone--so smooth, almost velvety. (First time trying a coticule, very new at this, have only used a Norton 4/8 for a short time.) About 10 light strokes and could see the water turn faintly grey. Followed it with 10 strokes on CrO2/balsa then 30 strokes on leather strop. Very pleased with result, both in sharpness and comfort. Very pleased with this stone!

Still curious about whether this is a combo stone with BBW on the back, or attached to an un-usable schist.