<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> 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>
when did the new £ 1 coins come into circulation
when did the new £ 1 coins come into circulation
28 March 2017
28 March 2017