Billy, They're five names for this style lock that I know of. They are Blakesley, Berkman, Chicago NoKey, Edwards, one with just NoKey, and one with nothing at all on it. I've got all but the Blakesley, which seems to be the toughest to find. I'll have to remember your trick on my next one, as I do pretty much the same by looking at them under a magnifying glass to find the wear patterns.