Britannia coins are British bullion coins issued by the Royal Mint in gold since 1987 and in silver since 1997. The original Britannia silver coins contain one troy ounce (1 oz) of silver and have a face value of £2.
Silver Britannias are also issued in fractional sizes of one-half, one-quarter, one-tenth, 1/20th and 1/40th of a troy ounce and with face values of £1, 50p, 20p, 10p and 5p respectively (that is, the quarter ounce silver piece is officially denominated as 50 pence). There is also a five-ounce coin of face value £10.
This coin has some historic value, as it was struck from silver recovered from the S.S. Gairsoppa, which is also indicated by the edge inscription.
The S.S. Gairsoppa was a British steam merchant ship built in Jarrow and launched in 1919. After a long civilian career, she saw service during the Second World War. She was named in honour of the town of Gerusoppa on the banks of River Sharavati in Karnataka, India, which due to its easy access to water transportation and as a distribution centre for crops including pepper, was the commercial capital for centuries.
She sailed with several convoys, before joining Convoy SL 64 in February 1941. Gairsoppa left the convoy when she exhausted the majority of her fuel and was making her way to Galway, Ireland, when a German U-boat fired a torpedo that sank her with the loss of 85 lives.
The wreck of the Gairsoppa was discovered in 2011, and it was announced that an operation to recover its cargo of silver bullion, with an estimated value of £150 million, would begin in 2012. On 18 July 2013 Odyssey Marine Exploration, of Tampa, Florida, reported that it had recovered 48 tons of silver, making this probably "the deepest, largest precious metal recovery in history" (as the Gairsoppa rests in 4,700 metres).
The silver which was recovered continued to its original destination - the Royal Mint - where it was refined and struck into these coins. The coins were issued in Brilliant Uncirculated grade and were released packed in coin tubes or individually, in carded packs (incl. some with an informational DVD). | 
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