No matter what, it is a beauty. I suspect it is a PL with the thick, flat ring (reverse). As well it doesn't seem to have the sharp clean strike of a SP which usually has some cameo.
I have read that at times, a SP dies were used on the PL (uncirculated) coins.
I have examples of both types and find it hard to tell them apart. Obviously the ones in the set are PL, but singly ? PL vs MS - PL has fewer bag marks, often it is the packaging that indicates which is which, or the honest seller (from a set or a roll).
Sorry, can't be of more help, will wait for an expert's opinion.

Edited by Sharks
11/23/2023 12:45 pm