Gold - Britannia - 1/40oz Proof

The one-fortieth-ounce Gold Britannia Proof series began in 2014 as the smallest regular coin in the expanded six-size proof family. The 50p coin contains 0.025 troy ounce of 999.9 fine gold and measures 8mm. Its tiny format preserves the annual proof artwork and royal portrait changes of the wider Britannia programme.