COMMEMORATIVE MEDALS, WORLD MEDALS, RUSSIA Alexander II (1818-1855-1881), Portrait Plaquette in “Bois Durci”, c.1855, bare head left, signed with wing, ALEXANDRE II EMPEREUR, rev impressed “Bois Durci”, 114mm, original suspension loop (Diakov -). Much as made, good very fine, a rare image of Alexander II and one of the rarest ‘Bois Durci’ portraits. Bois Durci, a mixture of hardwood sawdust, albumen and ox blood, was patented in Paris and in England in 1855, by François Charles Lepage £200-250
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