There are only 3 known authenticated and certified obverse mules on the Britannia Proof Gold Coin Series from Great Britain. In 1987, the Royal Mint introduced the gold Britannia coins as bullion coins in mint state and in proof for collectors. They were issued in 1 oz, 1/2 oz, 1/4 oz, and 1/10 oz sizes with face values in British Pounds of 100, 50, 25 and 10. 917 fine gold (22 carat) and are legal tender in Great Britain. Raphael Maklouf was the sculptor who designed the royal portrait of Queen Elizabeth. There have been 5 different portraits used on Great Britain’s coinage of Queen Elizabeth during her reign. The gold Britannias that were issued from 1987 through 1997 feature the 3rd portrait of Queen Elizabeth on the obverse, with the Britannia image on the reverse. The 4th portrait in 1998 to 2015 presented a more mature depiction of Queen Elizabeth. This amazing mint error occurred when the obverse die of Queen Elizabeth’s 3rd portrait (used to strike the gold Britannias from 1987 through 1997) was accidentally paired with the Britannia reverse die, instead of the correct and updated die depicting Queen Elizabeth’s 4th portrait (used from 1998 to 2015). This created a mule consisting of wrong paired dies. The 4th portrait was issued from 1998 to 2015, designed by Ian Rank-Broadley. Only 1,500 proof coins were issued in the 1/10 oz denomination when ordered by collectors. Gold mules are extremely rare and are among the most coveted types of mint errors. This is Great Britain’s first modern gold mule coin. For reference, the U. Has never struck a gold mule accidentally. There are only a few modern (in the last century) gold mules that are known from any country on any denomination. The item “2002 error 1/10 ounce mule gold proof £10, obverse of 1997, very rare” is in sale since Sunday, April 12, 2020. This item is in the category “Coins\Coins\British\Proof Sets/Coins\2000s”. The seller is “bwcoins” and is located in Glasgow. This item can be shipped worldwide.