A Fine Limoges Enameled Plaque

French, possibly 18th century, depicting the Madonna and child, afterÿGiovanni di Pietro "Lo Spagna", (Spanish/Italian, 1450-1528), grisaille on cobalt blue ground on copper, gilt accents, signed "NG"? to lower right, enamel to verso, sight 5-1/4 x 4 in.; framed; Provenance: Private Collection, Oklahoma City, Oklahoma
Condition Report: minor surface wear, some loss to gilt, warping to plaque, surface dirt; chips, gilt loss, and other wear to frame