One Pound GBP in 1956 had the purchasing power of about £16.73 GBP today.
NOTE - This historical conversion is the result of many calculations and considerations for which I cannot take credit. The resulting answer should only be regarded as an approximation.
The Royal Mint produced no British Five Pound coins from 1938 to 1979 inclusive.
One Pound British in 1860 had the purchasing power of about £63.10 GBP in 2010. This is an approximation based on the value of the pound in 1860 and the value of the pound in 2010, factoring for inflation.
There was no 1956 British Crown (Five Shillings) minted.
The face value of anything is whatever is written on it. The face value of a Pound, is a Pound. If you want to find out what the current exchange rate in US Dollars is for a British Pound, see the link below.
A British Pound in 1799 had the purchasing power of about £62.87 GBP today.
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The Shilling has always been 1/20th of a British Pound.
There was no 1811 British Sovereign or One Pound coin minted.
The Pound did not exist as a unit of currency in 1469.
It was worth one pound.
There was no British 1901 Two Pound or Double Sovereign coin produced.
The first British Fifty Pound note was issued in 1725.