1997 FIRST YEAR Silver Proof Britannia 4-Coin Set – Box & COA – Natural Toning. For sale is a 1997 Silver Proof Britannia Four-Coin Set, the very first year of issue in the Britannia series – making it one of the most desirable and collectible sets released by the Royal Mint. 50p Silver Proof Britannia. 20p Silver Proof Britannia. Original Royal Mint presentation box. The coins are housed in their original protective capsules. There is some natural toning, consistent with age – very common for silver proof coins from this era and often appreciated by collectors for the character it adds. The presentation box and COA are also included and well-preserved. Why This Set Is Special. First year of issue (1997) – a key date for any Britannia collection. Highly sought-after by silver and Royal Mint collectors. A fantastic opportunity to own this iconic inaugural Britannia silver proof set.