2014 Great Britain Gold Sovereign Proof Key Date LOWEST MINTAGE! What's the most collectable Sovereign? The 2014 issue because it has the lowest mintage at just 4,613?
Its edition limit was 7,500 individually with a further 3,500 available in sets though. So less than half of the coins available to be struck were actually required. It wasn't a hugely popular Sovereign at the time, which has resulted in it being. The 2017 Proof Sovereign has a far higher mintage at 13,500 - almost three times that of the 2014 Sovereign, but it is far more collectable.