Agree on all those points.
As we've discussed on the grading threads, I see many 16th/17th c. Poland coins, like these Riga shillings, graded these days.
I guess the TPGs must have some rules for dealing with those "defects" you mention (edge clips, flan spplits, etc. that are nt post-mint damage), in addition to rules for taking into account the quality of strike, presence of original luster (common on nicer examples of these issues like the OP's), etc.
Whatever those rules are, in some cases it results in coins with relatively low eye appeal getting MS grades, which I agree sounds like something Sheldon would never have expected of his system.
Edited by tdziemia
05/17/2019 01:58 am