Originally Posted by
Brontosaurus
No, but I'd love to see it if there is one. But I think the Behr-Manning name on the label would place it to the mid-1950s or later, as that is when B-M was fully absorbed by Norton (who in turn, are now owned by the French company, Saint-Gobain abrasives).
Also, about my earlier streaked comment about the later-marked lily whites, I looked at the picture again and the resolution is not all that good. So what I took for soft-Arkansas like marking might just be digitally-enhanced chatter, with the stones themselves possibly being uniformly white. I don't remember that streaking from when I looked at the pictures around six-seven years ago.