Watch List notes:

BRITISH COINS, Elizabeth I, Silver Halfcrown, Seventh issue, crowned ornate bust left with orb and sceptre, initial mark 1 (1601) both sides, rev quartered shield over long cross fourchée, 14.78g (N 2013; S 2583). Once cleaned, a few tiny digs in places, fine, reverse better.
from the David Sellwood collection

Estimate: £800-1000