LESBOS. Uncertain mint. Circa 478-460 BC. Twelfth Stater (Billon, 10 mm, 1.19 g). ΛE Confronted heads of two boars. Rev. Quadripartite incuse square. HGC 6, 1067. Lazzarini Series IV. A clear example. Very fine.

The interesting thing about this issue, which also includes other billon denominations, is that the two heads on the obverse are arranged in a way that makes the type into a single facing head!