The type of nicks that keep a coin from hitting 68 and above are so infinitesimally tny that you would never know they were even there even if you were looking at them with the 10 Power Loop.
states that a 70 grade is based on only 5x magnification and that is what I understand to be the standard ( PCGS
also uses that standard). ANACS states "5x, 7x, and 10x" usage, but doesn't specify for what.
So, if it cannot be seen at 5x, then it doesn't matter for a TPG
and I think that's quite reasonable.
In Memory Of Tootallious
3-31-1964 to 4-15-2020
"Riders in the Sky"