King of Prussia teapot

A RARE STAFFORDSHIRE SMALL SIZED SALT-GLAZED TEAPOT WITH CRABSTOCK HANDLE
AND SPOUT, HAND PAINTED WITH COLOURED ENAMELS WITH A PORTRAIT OF FREDERICK, KING OF PRUSSIA ON ONE SIDE, AND ON THE OTHER AN EAGLE ROYAL CREST. , THE BACKGROUND OF THE TEAPOT IS DECORATED WITH BLACK ERMINE SPOTS. THE FLAT LID HAS A BALL KNOP WITH STEAM HOLE THROUGH IT. Circa 1750