The British Britannia Silver 1/2oz Coin was first struck by the Royal Mint in 1997 and has been released every year since apart from the years 1999, 2000 and 2002, 2004 and 2006.
Each Britannia £1 One Pound Silver Proof Coin contains one half ounce of pure Silver and in 2013 the Royal Mint changed the metal content purity from .958 Silver to fine .999 Silver.
From 1997 till 2012 the weight was 16.227 Grams with a diameter of 27.00mm and from 2013 on-wards the weight was 15.71 Grams also with a diameter of 27.00mm.
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