Italy, Urbino, Guidobaldo II della Rovere (1538-74), Ducato d'oro, 3.43g, gvi. vbal. ii. .vrb. dvx. iiii, crowned oval arms, rev. invenimvs-sig. vict, St Helena with cross, (CNI.522/15; F.1203), marks on edge probably from a mount, very fine, rare
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