The Original. Now with 0.999 Purity. While silver Britannia has always offered beauty and reliability it now also gives you 0.999 purity. The legendary figure of Britannia has symbolised Britain’s strength and integrity on coinage since Roman times. Little wonder then that the silver Britannia, with such a depth of history behind it, has been a popular choice with bullion investors ever since its introduction in 1997. This new specification combined with its tradition and integrity gives new life for today’s investment customer. The 2013 Britannia Silver Bullion coin contains one ounce of 0.999 fine silver and measures an impressive 38.61mm in diameter.