The company has several symbols. I see at least six. Yours is different becuse it says P. T. The symbols in the book just have T's. This company is still in business today. I'm still checking. The year that vase was made it either had a green or blue underglaze. Just found it Tettau Porcelin Factory (Royal Bayreuth), Tettau, Bavaria, Germany, (W. Germany) Porcelin, Printed, blue after 1902 (1794-present) Royally Privileged Porcelin Factory Tettau GMBH