2015 Sovereign Gold Proof Unfrosted Obverse Die Error NGC PF 67 Coin
Rare 2015 gold proof [Sovereign](file:///buy-coins/sovereign/), graded by [NGC](https://www.ngccoin.uk/) and featuring an unusual die error causing the obverse to be struck without frosting. This error occurred when the gold [proof](file:///buy-coins/proof/) reverse design, featuring [Saint George](file:///blog/benedetto-pistrucci-saint-george-dragon/) and the dragon, was mistakenly paired with an unfrosted or unfinished [brilliant uncirculated](file:///buy-coins/brilliant-uncirculated/) obverse die, instead of the intended frosted proof design ([Ian Rank-Broadley](file:///blog/ian-rank-broadley/)'s portrait of [Queen Elizabeth II](file:///buy-coins/elizabeth-ii/)). - Errors like this are known as '[mules](file:///blog/mule-coins/)' after the offspring of a horse and a donkey - 22-carat gold coin struck to standard Sovereign specifications, with the exception of the finish - This example has been authenticated and graded by NGC, supplied sealed in its holder **Grade**: NGC PF 67 Ultra Cameo (#[6945996-002](https://www.ngccoin.uk/certlookup/6945996-002/67/))