Watch List notes:

BRITISH COINS, Philip and Mary, Silver Groat, crowned bust of Queen left, initial mark lis both sides, legend with Z for ET, rev quartered shield of arms upon long cross fourchée, 1.92g (N 1973; S 2508). A little weak of strike in legends, good very fine, toned and the rarer legend variety.
purchased from CNG, c.1998

Estimate: £600-800