About the 50p:
 
The original reverse of the coin, designed by Christopher Ironside, and used from 1971 to 2008, is the Badge of the Prince of Wales: a plume of ostrich feathers within a coronet, above the German motto ICH DIEN ("I serve"). The numeral "2" is written below the badge, and either NEW PENCE (1971–1981) or TWO PENCE (from 1982) is written above. However, a small number of 1983 "New Pence" coins exist. These coins are rather rare, and are considered collectors' items. It was originally planned that an alternative version of the 2p would be minted with a design representing Northern Ireland. These plans never came to fruition, however. The design was also re-cut in 1993 producing two minor varieties for that year.
 
To date, five different obverses have been used: four different portraits and the removal of the beaded border in 2008. In all cases, the inscription is ELIZABETH IID.G.REG.F.D. 2013, where 2013 is replaced by the year of minting. In the original design both sides of the coin are encircled by dots, a common feature on coins, known as beading.
 
As with all new decimal currency, until 1984 the portrait of Queen Elizabeth II by Arnold Machin appeared on the obverse, in which the Queen wears the 'Girls of Great Britain and Ireland' Tiara.
Between 1985 and 1997 the portrait by Raphael Maklouf was used, in which the Queen wears the George IV State Diadem. In 1992 the metal used in minting this coin was switched from bronze to copper-plated steel.
From 1998 to 2015 the portrait by Ian Rank-Broadley was used, again featuring the tiara, with a signature-mark IRB below the portrait.
 
As of June 2015, coins bearing the portrait by Jody Clark have been seen in circulation.
In August 2005 the Royal Mint launched a competition to find new reverse designs for all circulating coins apart from the £2 coin. The winner, announced in April 2008, was Matthew Dent, whose designs were gradually introduced into the circulating British coinage from mid-2008.
 
 The designs for the 1p, 2p, 5p, 10p, 20p and 50p coins depict sections of the Royal Shield that form the whole shield when placed together. The shield in its entirety was featured on the now-obsolete round £1 coin. The 2p coin depicts the second quarter of the shield, showing the Lion Rampant from the Royal Banner of Scotland, with the words TWO PENCE above. The coin's obverse remains largely unchanged, but the beading (the ring of dots around the coin's circumference), which no longer features on the coin's reverse, has also been removed from the obverse.