Fourth crowned portrait of HM Queen Elizabeth II facing right, wearing the Girls of Great Britain and Ireland tiara.

The Girls of Great Britain and Ireland tiara was a wedding present in 1947 from her grandmother, Queen Mary, who received it as a gift from the Girls of Great Britain and Ireland in 1893 on the occasion of her marriage to the Duke of York, later George V. Made by E. Wolfe & Co., it was purchased from Garrard & Co. by a committee organised by Lady Eve Greville. In 1914, Mary adapted the tiara to take 13 diamonds in place of the large oriental pearls surmounting the tiara. At first, Elizabeth wore the tiara without its base and pearls but the base was reattached in 1969. The Girls of Great Britain and Ireland Tiara is one of Elizabeth's most recognisable pieces of jewellery due to its widespread use on British banknotes and coinage.

Engraver: Ian Rank-Broadley

Barbary partridge left divides denomination.

This partridge has its main native range in North Africa, and is also native to Gibraltar. The Barbary partridge is a rotund bird, with a grey-brown back, grey breast and buff belly. The face is light grey with a broad reddish-brown gorget. It has rufous-streaked white flanks and red legs. When disturbed, it prefers to run rather than fly, but if necessary it flies a short distance on rounded wings.

AA, AB, AC, AD, BC are dieletters. These letters used are all uppercase and they take their distinctive style from Hiberno-Norse runes. They always appear on the reverse of the coins. Dieletters tell what die to stamp the coin was used. When AA gets worn or broken it is replaced by AB and so on. So AA is most common, AB is scarcer, etc.

Engraver: Alfred Ryman