Watch List notes:

BRITISH COINS, Commonwealth, Silver Halfcrown, 1653, English shield within laurel and palm branch, initial mark sun (1649-1657), rev English and Irish shield, value above within beaded circle, date above, 14.07g (ESC 431; N 2722; S 3215). Light surface marks, bold fine, reverse slightly better, lightly toned.
from the David Sellwood collection

Estimate: £300-400