Watch List notes:

BRITISH COINS, William III, Silver Halfcrown, 1698, first laureate and draped bust right, rev crowned cruciform modified shields, Lion of Nassau at centre, edge inscribed and dated DECIMO (ESC 554; S 3494). Both sides a little off-centre with a little haymarking, pleasing very fine, toned.
from the David Sellwood collection

Estimate: £300-400