Watch List notes:

William III (1694-1702). Halfpenny, 1700, third issue, unbarred A's in BRITANNIA. (BMC 697, S.3556). Some weakness otherwise practically Extremely Fine and probably about as struck for this issue. Rare.
Ex Simon Porter, sold to Dr Basil Nicholson 31/3/1980
Ex Dr Basil Nicholson Collection, No.133. Described by Nicholson as 'quite exceptional'.

Estimate: 360 GBP