GREAT BRITAIN: (1952-present) Queen Elizabeth II 1989 Proof Gold 4-Coin Britannia Set. The Royal Mint began the Britannia series in 1987 and has produced the gold proof sets for every year since. This four coin example has the original standing Britannia design and has the 1oz £100 coin, 1/2oz £50 coin, 1/4 oz £25 coin and the 1/10th £10 coin. They come presented in a case with certification - number 07