1990 Large & Small 5 Pence Set Silver Proofs. In 1990 the Royal Mint reduced the size of our 5 Pence. To commemorate this historic reduction in the size of our coin, the Royal Mint issued a Special collector’s set of the old large-sized coin and the new smaller sized coin. But this set was only struck in Proof Sterling Silver, which makes it very important today. We have just purchased a small holding of the large and small Sterling Silver 5 Pence Sets. Each set is in the original Royal Mint case as issued. This set is missing from many collections and I think that you will find it most interesting.