R.S. Prussia and Gouda Marks
R.S. PRUSSIA Pottery Dates Mark Erdmann Schlegelmilch 1880s-1890s Reinhold Schlegelmilch Late 1880s-1917 Carl Schlegelmilch 1882-1919 Oscar Schlegelmilch 1890s GOUDA Zenith Pottery Factory 1891+ Regina Art Pottery 1898-1910