If it is a coticule mined at Ardennes Coticule there is info on what vein the coticules harvested there are from. If it is a vintage piece there is no telling. The various mines gave different veins names specific to their own mine. More to facilitate work assignments, records of quantity harvested over time.

Back in those days a guy went to a barber supply or a hardware store, paid the $2.50 for the stone, and didn't even ask what vein it came out of. It is nice to know, if you can get the info, but I don't even look to see what they say the stone cuts like. I put a razor on it and see what it cuts like on my kitchen counter.