Watch List notes:

BRITISH COINS, Charles I, Silver Threepence, Aberystwyth mint (1638-1642), crowned bust left within circle, plume in front, value behind, initial mark book both sides, rev oval quartered shield of arms, plumes above, pellet stops in legend, 1.44g (Brooker 774; N 2341; S 2895). Tiny split at top of reverse, very fine, toned.
from the David Sellwood collection

Estimate: £120-150