Is this more or less a die chip by the D mint mark or deteriorating die? I know Zincoln’s quality. Still looks interesting. To me anyway. Ty!
As @paddyman98 already posted, most likely a plating blister. You know how I feel about Zincoln's and this is one reason.
Yes I know exactly how you feel on those. Dang and my gut always says don’t post! Lol! Or maybe it’s mountain man saying no no no! Lol!