The Royal Mint website says 1969, when 188,400,000 were released into circulation. Not bad considering that decimalisation was still two years away at that time...
Yes, there was a 1996 British 50 pence minted, but not for general circulation. They were issued in Royal Mint Proof Sets.
British Coins currently in circulation include the - 1 Penny 2 Pence 5 Pence 10 Pence 20 Pence 50 Pence 1 Pound 2 Pound 5 pound (although it is legal tender, it is not often seen in circulation) British banknotes currently in circulation include the - Five Pound Ten Pound Twenty Pound Fifty Pound
Fifty pence - British coin - was created in 1969.
British coins currently in circulation include the - 1 Penny 2 Pence 5 Pence 10 Pence 20 Pence 50 Pence 1 Pound 2 Pound 5 pound (although it is legal tender, it is not often seen in circulation) British banknotes currently in circulation include the - Five Pound Ten Pound Twenty Pound Fifty Pound
Zero. There is no silver in any British general circulation 50 Pence coin, and there has been no silver in any British general circulation coin from 1947 onwards.
The British 2008 "dateless" 20 Pence coin may be worth Fifty Pounds, some people think it may be worth more. Some 'Proof piedfort in silver FDC" 20 Pence coins might get up to Fifty Pounds, but then, they cost a lot to buy in the first place. Most British 20 Pence coins are worth 20 Pence.
There were no British 1975 25 Pence coins issued.
There never was an "old" 50p coin. The 50p denomination was introduced as part of the switchover to decimal pounds during the period 1968-71. 50p coins started circulating in 1968 because they exactly replaced the old 10 shilling note. Circulation of 1p coins was postponed until full decimalisation in February 1971, because that denomination did not mesh exactly with any of the coins in use up to that time.
The Penny is the basic unit of the British currency. Since decimalisation, there are 100 pence to the Pound. The decimal Penny, Two Pence, Five Pence, Ten Pence, Twenty Pence and Fifty Pence coins are still in circulation, and will be for a long time yet. The predecimal Pennies and variants such as the Halfpenny, Threepence, Sixpence along with the other predecimal currency, have been progressively demonetised since the full introduction of decimal currency in February, 1971.
The 10 New Pence coin was not introduced until 1968.
The larger pre-1991 5 Pence coins were withdrawn from circulation and demonetised in 1991. So, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value. The smaller (18 mm) coins from 1990 onwards are still potentially in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 5 Pence.
The British 20 Pence coin was first issued on the 9th of June, 1982. The 20p denomination was first minted in 1982. It was introduced to help with change-making, because people were finding themselves awash in 10p coins. The situation was made worse because at that time the 10p coin was the same huge size as the old florin that it replaced after decimalisation. The 20p coin is also notable because it was the first decimal coin to have its denomination expressed simply in pence rather than "new pence".