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Ask Utopian about carborundom stones. Hirlau has quite a few too. They could probably tell you if it is intended for razors or for tools/knives.

I've seen one other, maybe one you've seen too. it was sold by Thomas in Germany, dpcollect on ebay, and was a long yellow/green stone. Paper box, the label was like the one in my picture but only...

Andrew, Great score ! I also had a NOS B/G, mine was a 5x2&1/2 in the box, with slurry stone. Had the ink stamps on the honing side, and all the labels. I held off for maybe a month before I began...