Attica Auctions, Auction 8B (in association with NAC), Lot 505 Principality of Achaia, Guillaume de Villehardouin, 1246-1278. Billon Petty denomination issue, small module, 0.33g, 12mm (Baker 451-454; Metcalf, Ashmolean, type 9, Blankenberg -). Some corrosion on both sides without disturbing the design, overall strong details, good fine and extremely rare.