PARIS, BIBLIOTHEQUE NATIONALE, Fonds Italien, Cod. 1595, foll. 441r-442r
"Regule ad extrahendum litteras ziferatas, sine exemplo," attributed to Cicco Simonetta, First Secretary of Galeazzo Maria Sforza, Duke of Milan. Pavia, July 4, 1474. Original. [Image 2 of 4]

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