Ü Keramik always used white clay. The great majority of items have just the form number and size numbers separated by “/”. Size measurements are given in cm. The text used is quite distinctive, it is usually incised but is occasionally embossed.
Sometimes bases were un-marked or over glazed so numbers cannot be read.
The only time a company name was added was by an ink stamp on early items or hand stamped on studio items, otherwise it is absent.
Ü Keramik labelled many of their items with foil stickers.