Wiltshire 20, Salisbury (Dalton & Hamer, page 315)

Denomination: halfpenny, scarcity: Very rare (RR)
20.  O: A cypher W G M, the date 1791 under. HALFPENNY above. Same for Nos. 19-20,
        as rev. of No. 12.
     R: Two busts. LOUIS XVI ET M. ANTOINETTE &c.
     E: Milled.

No. 20, RR.

Keywords

wgm,1791,halfpenny,louis xvi et m antoinette roi et reine de france