<P> The British one pound (£ 1) coin is a denomination of the pound sterling . Its obverse bears the Latin engraving DG REG "Dei Gratia Regina" meaning, "By the grace of God, Queen" and FD meaning" Fidei defensatrix" Defender of the Faith . It has featured the profile of Queen Elizabeth II since the coin's introduction on 21 April 1983 . Four different portraits of the Queen have been used, with the latest design by Jody Clark being introduced in 2015 . The design on the reverse side of the new 2017 coin features four emblems to represent each of the nations of the United Kingdom--the English rose, the leek for Wales, the Scottish thistle, and the shamrock for Northern Ireland--emerging from a single stem within a crown . </P> <P> The £ 1 coin replaced the Bank of England £ 1 note, which ceased to be issued at the end of 1984 and was removed from circulation on 11 March 1988, though still redeemable at the Bank's offices, like all English banknotes . One - pound notes continue to be issued in Jersey, Guernsey and the Isle of Man, and by the Royal Bank of Scotland, but the pound coin is much more widely used . </P> <P> Since 28 March 2017, two versions of the one pound coin have been in circulation--the original round design and a new dodecagonal (12 - sided) design . As of March 2014 there were an estimated 1,553 million round £ 1 coins in circulation, of which the Royal Mint estimated in 2014 that 3.04% (i.e. about 47 million) were counterfeit . In an effort to counter this, the Royal Mint introduced the new 12 - sided coin, which is bimetallic like the current £ 2 coin, and features an undisclosed hidden security feature called' iSIS' (Integrated Secure Identification Systems). The round pound will remain in circulation until 15 October 2017 . After that date, the older coin can only be redeemed at banks . </P> <P> To date, five different obverses have been used . For the first three of these, the inscription was ELIZABETH II D.G. REG. F.D. 2013, where 2013 is replaced by the year of minting . The fourth design, unveiled in March 2015, expanded the inscription slightly to ELIZABETH II DEI. GRA. REG. FID. DEF. 2015 . The fifth design, introduced in March 2017, reverted to D.G. REG. F.D. </P>

When did the new £1 coins come into circulation