Rivet-like Seal

Rivet-like Seal, Image by StuE, Found by John GM
Found on Thames foreshore, 19mm, 9.7g.

Circular mound at centre, ...UE(R?) around // circular indentation at centre, ...ES 638... around

No product, company or organisation has yet been associated with this seal. Although it is of the bulla type it has the appearance of a rivet.

See BSG.BS.01186 for similar seal.