Spur Ryal Público Deposited
A term generally applied to the half of the Ryal which was first issued in the reign of Edward IV, but more particularly to the gold fifteen Shilling piece of the fifth coinage of James I (1619), the rays of the sun on this coin resembling the rowels of a spur.
- Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)