The lion curves to his left side. Possibly an attachment from the rim of an oinochoe.
von Bothmer, Dietrich and René d'Harnoncourt. 1950. Greek, Etruscan, and Roman Antiquities: An Exhibition from the Collection of Walter Cummings Baker, Esq. no. 37, p. 9, New York: Walter Cummings Baker.
von Bothmer, Dietrich. 1961. Ancient Art from New York Private Collections: Catalogue of an Exhibition Held at the Metropolitan Museum of Art, December, 17, 1959-February 28, 1960. no. 137, pp. 35-36, pl. 44, New York: The Metropolitan Museum of Art.