Sotheby & Co. Catalogue of Silver Pennies of King Stephen from the Prestwich (Duchy of Lancaster) Hoard (1971) and other Hammered Silver Coins of England, Scotland and Ireland. The Property of Various Owners. London 06 December 1974. Brossura ed. lotti 231, tavv. 11 in b/n. Con lista prezzi di stima e di realizzo. Buono stato.