Watch List notes:

BRITISH COMMEMORATIVE MEDALS. William & Mary, Coronation 1689, Silver Medal, by John Roettier, conjoined busts of William and Mary to right, rev Jove hurls thunder at Phaeton falling from his chariot, 37mm (MI 662/25; Eimer 312). Choice extremely fine, attractively toned and a pleasing medal.
The official Coronation medal of William & Mary; this example is unusual in being struck on a large flan (more usually 35mm).

Estimate: £600-800