Gravenreutherstraße 7/1 & 11,(37) Bayreuth. Bavaria.
Hersteller / Manufacturer.
Founded in 1886 by Siegmund Paul Meyer, it became a G.m.b.H in 1920 whilst still remaining a family firm. Now run by the third generation Rudolf & Maria Meyer.
Reference: Porcelain Marks & More Bayreuther Adressbücher
"Edel sei der Mensch, Hilfreich und gut". Man is noble, good and helpful. Judging from the horse drawn ambulance, dated 1910 - 1914. 
Ink stamp, dated 1899 - 1929, on the featured stein above. 
"K. Köhler, Gefrees," touchmark on the underside of the lid of the featured stein above. 
Ink stamp, dated 1899 - 1929.
Ink stamp, dated 1956. Used as late as 1990. 
Porcelain stein dated circa 1971 
Basemark on featured stein, dated circa 1971. P.W.B. standing for Porzellanfabrik Walküre, Bayreuth. 