In NGC's Chinese Medals Census, they have two categories for the Brass Classic Gardens-Old Summer Palace ("Yuan Ming Yuan")
(2014) CLASSIC GARDENS - 40mm OLD SUMMER PALACE
There is PFUC and PFMA.
Then, I see in the NGC entry for 2014 XIE QU, the Brass is PFMA. There is only one category of Brass for the 2014 XIE QU.
If I then look at Frank's article, for the Old Summer Palace there is both Brass (Proof) and Brass (Stained)
Does anyone know if the NGC 2014 Old Summer Palace PFMA is the stained or unstained version?