Discussion in 'US Coins Forum' started by SensibleSal66, Dec 4, 2020.
THEM . Thanks in advance. Here's just one of mine
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Unusual, maybe. After all it is steel.
1) TPG's use magnification to look for evidence of scratches on the surface.
2) The altered color of the coin.
3) And special lighting that picks up traces of chemical residue on the surface
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