Watch List notes:

STUART. Charles I. 1625-1649. AR Groat (23mm, 2.07 g, 2h). Aberystwyth mint; im: open book. Struck 1638/9-1642. Crowned and mantled bust right, with short collared-ruff and visible armor; plume to left, IIII (mark of value) to right) / Coat-if-arms; plumes above. Brooker 771 (same rev. die); North 2339; SCBC 2892. Deep iridescent toning, minor areas of weak strike. VF.

From the New Horizons Collection.