This mortar is decorated with a frieze of grotesque masks and stylized palmettes under garlands; a band of acanthus leaves is under the rim. The lack of wear and the crude facture corroborate the late dating.
Catalogue entry from: Frits Scholten. The Robert Lehman Collection. European Sculpture and Metalwork, Vol. XII. Frits Scholten, New York: The Metropolitan Museum of Art in association with Princeton University Press, 2011, p. 199.