1,801,500 is for the 2017 Newton 50 pence while the 2018 Strike Your Own Newton 50 pence has a mintage of 19,934.
Kew Gardens is still the lowest for a coin meant for circulation for modern 50 pence coins. The next on the list is the 2017 Royal Shield 50 pence which the mintage figures was 1,800,000. https://www.changechecker.org/category/mintages/
We don't know the mintage of the 2018 Snowman 50 pence which was a not for circulation coin.
The current strike your own coin is a 2018 Britannia 50 pence which according to the mint is that will be the only way to obtain it.
Now if you allow the old style 50 pence coins which were meant for circulation to be added to the list, then the lowest mintage is the 109,000 for the 1992-1993 Single Market - EEC, then the 2009 Kew Gardens, then the 1985 large style Britannia with a mintage of 682,103.
Kew Gardens is still the lowest for a coin meant for circulation for modern 50 pence coins. The next on the list is the 2017 Royal Shield 50 pence which the mintage figures was 1,800,000. https://www.changechecker.org/category/mintages/
We don't know the mintage of the 2018 Snowman 50 pence which was a not for circulation coin.
The current strike your own coin is a 2018 Britannia 50 pence which according to the mint is that will be the only way to obtain it.
Now if you allow the old style 50 pence coins which were meant for circulation to be added to the list, then the lowest mintage is the 109,000 for the 1992-1993 Single Market - EEC, then the 2009 Kew Gardens, then the 1985 large style Britannia with a mintage of 682,103.


















