Is the study or collection of currency, including coins, tokens, paper money, and related objects. Which is a hobby of mine.
Found this 'rarer' 2016 new 12 sided £1 this morning.
As a comparison, a 2017 is on the left
Micro inscriptions on inner the edges -
One Pound - on the Obverse (left of picture above)
Date - 2016 - on the Reverse (right of picture above)
And if you are really lucky, you'll pick up a 2016 coin with a 2017 inscription.