The Flag of the Colony of Aden was used as the official flag for the British Colony of Aden  from 1937 until 18 January 1963 when it was renamed the State of Aden and subsequently used the Flag of the State of Aden under the Federation of South Arabia. However, there is evidence that the flag was used after 1963 in Perim

Perim

Perim is a volcanic island strategically located in the Strait of Mandeb at the southern entrance into the Red Sea, off the southwestern coast of Yemen, at . It has a surface area of 13 square kilometers and rises to an altitude of 65 meters. The island has a natural harbour on its southwestern...

 and the Kuria Muria islands.

A navy blue flag with the Union jack in the top left corner, it featured a badge like that of colonial Zanzibar, with a two-masted Arab dhow

Dhow

Dhow is the generic name of a number of traditional sailing vessels with one or more masts with lateen sails used in the Red Sea and Indian Ocean region. Some historians believe the dhow was invented by Arabs but this is disputed by some others. Dhows typically weigh 300 to 500 tons, and have a...

 sailing on turquoise waters, designed by George Kruger-Gray of the Royal Mint

Royal Mint

The Royal Mint is the body permitted to manufacture, or mint, coins in the United Kingdom. The Mint originated over 1,100 years ago, but since 2009 it operates as Royal Mint Ltd, a company which has an exclusive contract with HM Treasury to supply all coinage for the UK...

.