Cloth Seal, Gloucestershire/Somerset, Alnage, NB, Image & Found by Derfel.
Found on Thames foreshore, 39 x 18mm.
Blank // NB, SOMERSET GLOSTE(R) around // arms of Stuart Britain // privy mark
See Egan, G., 1987, seals no. 593, 2102, 4597 and 4664, p.121, "These seem to be seals for Gloucestershire and Somerset together. They may have been for the fabrics woven in an industrial area comprising north Somerset and part of Gloucestershire, as well as Wiltshire. The alnager NB also appears on Wiltshire, Dorset, and Devon seals, as well as other examples."