Type 12 A; Lamps with Flat Rims and Central Cones; Flat Bases Well Type 12 B; Lamps with Flat Rims and Central Cones; Raised Bases Broneer, Corinth, Vol. IV, Part II, Terracotta Lamps, Type II CL 3918 Hesperia, XVI, 1947, p. 237 Hesperia, VII, 1938, p. 610, no. 241, figs. 30, 31 Hesperia, XXV, 1956, nos. 92, 93, pl. 59
2nd quarter of 6th B.C. 2nd half of 6th B.C. Late 3rd quarter of 6th B.C.-early years of 5th B.C.