Silver, 39.4mm diameter, 24.73 grams.  CAR: D: G: REX NEAP: HISP: INFANS &c  Crowned arms, M: M: at sides, ·A· to right., G:120 below.  Rv. DE SOCIO PRINCEPS Vulcan reclining holding spade, Mount Vesuvius in the distance, De 1747· G· in ex.  Craig 23, KM 147, Dav. 1397.  One quadrant of reverse weakly struck, otherwise strong Good Fine/Fine.  Rare.