Watch List notes:

BRITISH COINS, Charles I, Silver Pattern Half-Groat, by Nicholas Briot, crowned bust left, value between lozenges behind, linear circle and legend surrounding both sides, initial mark lozenge, rev quartered shield on long cross fourchée, 1.00g (Brooker 721; N 2302; S 2856). Good very fine, toned and scarce.
purchased from CNG, c.2002

Estimate: £150-200