Base
ES Keramik almost always used white clay. Most items had just the form number and height detailed on the base without any text. These markings can be either incised or embossed and are separated by “/”.

Many ES pieces had no base markings at all. These may be later production items. This makes identification difficult.

Stickers/Labels

ES Keramik items sometimes retain their original stickers. Labels were made of metal foil.