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One way is by the measurements of the stone. I've had three or four Barber's Delight Eschers come, and go. All of the BD I've ever seen are the same size, IIRC that is 2"x6" for the main stone, + the...

My 'holy grail' was the yellow/green escher, and I've got one. Next I guess would be, in terms of value, (usefulness) the Suehiro Gokumyo 20k. OTOH, if you don't have at least a Norton 4/8, or the...