The house flag of the Silver Line Ltd, London. A rectangular blue and white triband with the word 'SILVER' in blue across the centre stripe. The flag is made of a wool and synthetic fibre bunting. It has a cotton hoist and is machine sewn. A rope and toggle is attached.

The Silver Line began in London as a partnership between brothers Stanley and John Thompson in 1908. Throughout the 1920’s the company became managing agents for such shipping companies as the St. Helens Steam Shipping Company, the America-Levant Line, and the Kerr Steam Shipping Company. By the 1930’s the company was offering global passenger/cargo services, including ports of call in the Philippines, the Dutch East Indies, India and the Persian Gulf. 11 Silver Line ships were lost during World War II. After the war, in 1947, the company’s management changed from the Thompson family to the Barraclough family. Consequently, the Silver Line’s passenger/cargo liners were sold and the company switched to strictly cargo and tramping operations. In 1957 the Silver Line became a fully owned subsidiary of the Dene Line Ltd. It became part of the Seabridge consortium in 1965 along with the Hunting, Bibby, Bowring, Clarkson and Houlder Lines to operate large bulk carriers. In the same year, Silver Chemical Tankers Ltd was created to carry chemical cargoes, with many trips to the Baltic region. During the 1970’s the company was acquired by Navcot Holdings Ltd. The last Silver Line ship, the ‘Silverhawk’, was sold to the Sea Cheer Investment Trust of Panama in 1985. Many of the early Silver Line ships had ‘Silver’ with the name of a tree following (i.e. ‘Silverash’, ‘Silverbirch’), and later ships had ‘Silver’ with the name of a bird following (i.e. ‘Silverfalcon’, ‘Silvereagle’).