The number is the serial number of each coin. It's supposed to be there. I would be surprised if a TPG considered that damage. btw I helped...
I am doing something similar, although I am not going for certified. In fact, it surprises me how many of us there are pursuing the same goal....
I can't afford one either, and places I've found on the net that will do rental or let you send in samples for testing also charge amounts I...
Did you ever find that article? I have a scanned copy I can email you if interested. Your avatar looks like the magnesium coin. I've got one...
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