Antique oil painting portrait study of stable boy

Antique oil painting portrait study of stable boy. English School, circa 1900 - it's difficult to determine the exact age of this item - possibly circa 1900 but it could be later. Unsigned, artist unknown. Oil on board. Elaborate gilt gesso frame. Size of frame: 15.25 x 13.25 inches; Size of portrait: 12 x 10 inches; Size of front painting aperture: 11.25 x 9.25 inches. Weight: 1.2 kg (allow 5 kg volumetric weight once packed). Reasonable condition for its age.