Marius and Hugo van Woerden produced a large range of volcanic pieces between 1964 - 1984.
They usually had paper labels - but this one has long gone. This shape is in the E category ... somewhere between E5 and E6.
Marius himself has been contacted and he identified this as one from his atelier, but the number 2120 was not by him - possibly a wholesaler or retailers number added later.
It is white clay with a white volcanic glaze on brown/black ... on a two part mold.
Height 7.5cm Length 12cm Width 6.5cm
Price: 50€ plus shipping