Ray, I wouldn't assume any W/F coil measuring less that 24.5-25.0mm to necessarily be a good coil. If the one I have was off cover, I don't think it would get certified as good--not even sure it would on the cover. 24.5mm can't necessarily be assumed good. Yes, the real experts in the field can tell the difference in the edge cut from during the manufacture process and cuts done after--not sure that I can. A "feathered" edge may be an indication of a good edge. Not all W/F coils were hand cut--only some of the very early W/F coils. A "divot" pretty much tells you perfs were trimmed off. Regarding the early (perf 12) W/Fs, there are as many or perhaps more fakes in the market than ligit. ones. Even later W/F coils have many fakes out there. I get circuit books from the APS and many of the W/F coils in those circuits are not ligit. coils and those on auction sites can be iffy too. I suppose W/F coils is a bit of a mine field.
