Rescript addressed to all War & Domain Chambers issued by King Fredrick II of Prussia [Prussia / Present-day Germany, Poland, Czech Republic]: “When Jews have to take porcelains for special Benefactions (‘Beneficien’), they are to take a third of each kind so that porcelain can be exported and its benefits can be known everywhere.” [Researcher’s note: The same day, it was also ordered that “no Jew is to be given any further concessions, until he has provided a certificate from customs (at the border) that the porcelain which he got from the local porcelain manufacturer was in fact sent out of the country.”]
Stern, Selma: Der Preussische Staat und die Juden, Dritter Teil, 2. Akten, 1. Halbband (The Prussian State and the Jews) (1971) p. 517-518, Researched and Translated by Ziba Shadjaani 1/26/2016