Watch List notes:

BRITISH COINS, Charles I, Silver Halfcrown, Tower mint, group II, type 2c, king on horseback left with sword resting on shoulder, plume to horse's head, cross on housings, initial mark harp (1632-1633) both sides, rev large quartered oval shield of arms with garnish, C and R either side, 14.89g (N 2207; S 2771). Flan a little irregular with a myriad of light metal flaws on the obverse surface, fine / good fine, lightly toned.
from the David Sellwood collection

Estimate: £150-200