Incorporated into : 1886 Blything RDC (1934 Blyth RDC (1974 Suffolk Coastal))
I don't know whether the borough ever had official arms.
The historical seal, known from the 13th century, showed a ship.
The seal of Dunwich from around 1200 (Ewe, 1972)
On a Jaja card from around 1905 different arms appear :