Watch List notes:

BRITISH COINS, Other Properties, Charles I (1625-1649), Silver Halfcrowns (11), Tower Mint (10), group II (2), type 2a, plume, rev lis between CR, type 2c, portcullis; group III (7), type 3a1 (2), crown, type 3a2 (3), triangle, another with rough ground, triangle, same type, finer horseman, star; type 3a3 (2), (R) and eye; group IV, triangle in circle; Exeter mint, 1644, horse with twisted tail (S 2769, 2771, 2776, 2777, 2778, 2779, 3075). Poor to fine. (11)
from the David Sellwood Collection

Estimate: £400-600