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A British 'Fifty Shillings' (50/-) coin has only ever been minted once, in the year 1656. It was a milled gold coin weighing 22.7 grams and with a diameter of 30 millimetres. Only eleven examples are known to exist, and they have a current value of approximately £15,000 - £20,000 each.
The obverse of the coin depicts Oliver Cromwell as a Roman Emperor, with the inscription OLIVAR D G R P ANG SCO HIB &c PRO -- ''Oliver, by the grace of God Protector of the Republic of England, Scotland, Ireland, etc.''. The reverse depicts a crowned shield bearing the Commonwealth arms, with the inscription PAX QVAERITUR BELLO 1656 -- ''Peace is sought through war'', while there is an edge inscription PROTECTOR LITERIS LITERAE NVMMIS CORONA ET SALVS -- ''A protector of the letters, the letters are a garland and a safeguard to the coinage''.
For other denominations, see British coinage.