I was asked a few years ago about some provenance for the small hand cups I produce. I have finally found an extant example of a beaker very similar to mine.
This is a beaker in the British Museum attributed as being Neolithic/Bronze Age pottery.
https://www.britishmuseum.org/collection/object/H_POA-194-2
These are some hand cups I have previously made. These have a modern glaze to make cleaning easier and prevent potential bacterial growth in the clay body.
Working with Clay 