Watch List notes:

BRITISH COINS, Charles I, Silver Halfcrown, Tower mint, group III, type 3a1, king on horseback left with upright sword breaking into legend, sash flowing from waist initial mark bell (1634-1635) both sides, rev quartered oval shield of arms with garnish, 15.14g (N 2209; S 2773). Large scratch from hindquarters of horse to legend, good fine / about very fine and lightly toned.
from the David Sellwood collection

Estimate: £150-200