Pound Public Deposited
Silver Pounds and Half Pounds occur only in the Declaration Type coinage of Charles I, and were struck at Oxford and Shrewsbury. They are marked re- spectively with the figures XX and X.
The Half Pound struck at Exeter was from the die of a Crown and is a Half Pound only as regards weight.
- Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)