Populonia 20 units obverse
AR 20 units 8.3231 gm, 21.5 mm
3rd century BC
1. Rutter, N.K. 2001. Historia Numorum Italy. Page 34 #152 and Plate 3 #152. London: The British Museum Press.
2. Sambon, Arthur. 1903. Les monnaies antiques de l'Italie. Fascicule 1. Page 51 #48. Paris: Bureau du Musée.
3. 1969. Sylloge Nummorum Graecorum. The Collection of the American Numismatic Society. Part 1. Etrutia - Calabria. #78. New York: The American Numismatic Society.
4. Grose, S. W. 1926. Fitzwilliam Museum Catalogue of the McClean Collection of Greek Coins. Volume I. Western Europe, Magna Graecia, Sicily. Page 19 #130 Plate 8 #8. Cambridge: Cambridge University Press.
5. Vecchi, Italo. 1990. The Coinage of the Rasna. A Study in Etruscan Numismatics. In Schweizerische Numismatische Rundschau: Band 69, edited by Hurter, Silvia and Martin Körner; Pages 13 #27/79 and Plate 3 #27/79 (this coin). Bern: Paul Haupt AG.
Gorgon with diadem and protruding tongue, X:X value marks below.
Blank reverse with protrusion, possibly overstruck sepia.