Charles I. AR pound, 1625-1649. 54 mm, 120.2 g. Dated 1643. 
Oxford mint. Declaration type. Mintmark: plume with bands.

CAROLVS D G MAG BRIT FRA ET HIBER REX, Charles, holding sword and reins, on horseback left, trampling arms below; plume to right.
EXVRGAT DEVS DISSIPENTVR INIMICI RELIG PROT LEG around, ANGL LIBER PAR in two lines between parallel lines; three Oxford plumes and XX (value mark) above, 1643 below. 

Seaby 2938; Brooker 863; North 2397.

With permission of cngcoins.com, auction Triton XXII, lot 1425.