I am looking for comparisons for slate styli. At present I only know of two such objects, one from a reliable context from Bath, found in the fill of a beam slot dated to AD 80-90. Its 35 mm-long shaft with a diameter of 4.4–5.4 mm has seven unequal facets and tapers slightly before the used tip.
The other one comes from a Roman villa site in Swindon, but unfortunately it was unstratified, and the site also has a small medieval element.
Does anyone know of such objects? They could be used to write on slate tablets, but are they really writing implements?