Arms : Barry wavy of six Azure and Argent thereon a Ship in full sail and in base three Fish two and one all proper on a Chief Sable two Steel Ingots proper and between them on a Pale Or a Blast Furnace also proper.
Crest : On a Wreath Argent and Azure a Lion rampant Gules supporting a flaming Beacon proper.
Motto: 'MARE ET FERRO' - By sea and iron
The arms were officially granted on October 10, 1922.
The ship and blue and white waves represent the overseas trade from the River Tees, and the fishes are the emblem of the ancient fishing industry. The blast furnace and ingot represent the iron and steel industry, upon the prosperity of which the town greatly depended.
The lion is from the arms of Lord Zetland, the leading landowner in the Borough.
The motto, meant that the town profited by seaside patronage in the summer, but was dependent for its main prosperity upon the manufacture of steel.
The arms as used on a JaJa postcard +/- 1905