The first British One Pound note was issued in 1797.
There were notes issued prior to the establishment of the Bank of England in 1694, but these were more of a Promissory Note than currency of the realm, and were often for irregular or unusual sums.
It is thought that very few notes have survived from prior to 1775.
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.
A British Pound in 1799 had the purchasing power of about £62.87 GBP today.
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.
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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.
There were no British Two Pound coins minted from 1888 to 1892 inclusive.
A pound surely!!