Brandenburg vs. Kingdom of Prussia 1787

How accurate are the attributions by Gerhard Schon in his German-language catalogs?

My 1/3 thaler 1787A is listed in Numista and in Krause under Prussia:

https://en.numista.com/catalogue/pieces14912.html

In Schon's catalog (2008 edition), it is listed as Brandenburg Schon 158 (page 169).

Who is right??

I would say Kingdom of Prussia, because of the tekst "King of Prussia". Fron 1701 to 1806 Brandenburg was seen as a part of Prussia. I would chose Kingdom Prussia.