Signed, in the negative, lower right: G. Sommer - Napoli
Stamped, on mount verso, lower left: DETROIT INSTITUTE OF ARTS | REFERENCE LIBRARY Marks, in pencil, below the stamp: g. of E.B.W.
Inscribed, in the negative, lower left: 1114 Napoli Marina Inscribed, in ink, on the mount, lower center: Naples - Italy