1997 Royal Mint Britannia Fine Silver, Silver Proof 4-coin Collection, in the Royal Mint green box of issue, with COA. The 4 coin set, includes the following Silver Proof coins. 50p – Minimum fine silver content 1/4oz, weight 8.114g, Diameter 22.00mm. 20p – Minimum fine silver content 1/10oz, weight 3.246g, Diameter 16.50mm. Presented in: Royal Mint 4-coin set green box, screw capsules, with COA. From a smoke free and pet free home. It will be well protected and packaged.