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Britannia coins are British bullion coins issued by the Royal Mint in gold since 1987 and in silver since 1997. Britannia gold coins contain one troy ounce of gold and have a face value of £100. Gold Britannias also are issued in fractional sizes of one-half, one-quarter, and one-tenth of a troy ounce and with face values of £50, £25, and £10 respectively. In 2013 two additional sizes were introduced, a five-ounce coin of face value £500, and a fractional size of one-twentieth of face value £5.〔(Mrs Thatcher? No that's Britannia! One in four adults cannot recognise figure that has symbolised Britain since Roman times ) ''Daily Mail'' 30 July 2013〕 Britannia silver coins contain one troy ounce of silver and have a face value of £2. Silver Britannias also are issued in fractional sizes of one-half, one-quarter, and one-tenth of a troy ounce and with face values of £1, 50p, and 20p respectively. Like the gold coins in 2013 two additional sizes were introduced, a five-ounce coin of face value £10, and a fractional size of one-twentieth of face value 10p.〔 ==Gold Britannia== From 2013 the gold coins have a millesimal fineness of .9999 (or 24 carat gold). Until 2012 the gold coins have a millesimal fineness of .917 (91.7% or 22 carat gold) with the non-gold component being copper until 1989 and silver from 1990. 2013– Gold Britannia specifications (gold content, and approx total weight) :Five ounces: diameter 65 mm, (156.295 g) :One ounce (2013) : diameter 38.61 mm, (31.104 g) 'larger thinner coin' just for 2013 :One ounce (2014–) : diameter 32.69 mm, (31.104 g) :Half ounce: diameter 27 mm, (15.60 g) :One quarter ounce: diameter 22 mm, (7.86 g) :One tenth ounce: diameter 16.50 mm, (3.13 g) :One twentieth ounce: diameter 12 mm, (1.58 g) 1987–2012 Gold Britannia specifications (gold content, not total weight) :One ounce: diameter 32.69 mm, (31.104 g) (total wt 34.050 g) :Half ounce: diameter 27.00 mm, (15.552 g) :Quarter ounce: diameter 22.00 mm,(7.776 g) :Tenth ounce: diameter 16.50 mm, (3.110 g) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Britannia (coin)」の詳細全文を読む スポンサード リンク
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