Charles I. 1625-49. Oxford mint, AR pound. 1642. 

Obv: CAROLVS : D : G : MAG : BRIT : FRA : ET : HIBER : REX, King, crowned and holding sword upright, on horseback left, plume to right, arms beneath horse.
Rev: EXVRGAT : DEVS : DISSIPENTVR : INIMICI around; RELIG : PROT : LEG / ANG : LIBER : PAR in two lines across field; XX above (=20 shillings) and three plumes in upper field; date 1642 below.

cf BMC 629; Morrieson A-1. S. 2937. North 2396. 

Estimate £60,000.
Courtesy of Alan Davisson Auction Dec. 2009, lot 396. 
Added April 2010.