Lot Essay
Cf. M. Henig. The Lewis Collection of Gemstones, British Archaeological Reports Supp. Series 1, 1975, p. 48, nos. 185-186, pl. 12. "It is generally thought that the type represents a visit to an oracle such as Dionysios of Halikarnassos describes at Tiora (Ant. rom, 1, 14) where the responses were given by a woodpecker."