Small antique French watercolour painting portrait of man playing mandolin by Mabry 1858

Small antique French watercolour painting portrait of man playing mandolin by Mabry 1858. French, dated 1858 (on reverse). Unsigned but provenance on reverse: "par Francois-Eugene Mabry, Mont Valerien, Mai 1858". "Fort Mont-Valérien is a 19th-century military fortress that became one of France’s most symbolic sites of resistance during WWII". Glazed watercolour. Wooden oak frame. Size of frame: 7.5 x 6.25 inches; Size of painting: 5.5 x 4.5 inches; Size of front painting aperture: 4.5 x 3.5 inches. Weight: 272g (allow 1 kg once packed). Reasonable condition for its age.