Watch List notes:

BRITISH COINS, Anne, pattern farthing in tin, 1713, large thick flan, S & G reverse upright, bust l., rev. PAX.MISSA.PER.ORBEM, Peace standing in biga driving at a gallop to r., date below (P.766), struck from rusty dies, about as struck, extremely rare
*ex R. Heseltine

Estimate: £450-550