19th century portrait miniature by Ambrose Duval, portrait of a lady, depicted in blue dress with draping pearls, with brown curled hair, headpiece and earrings, in tones of blue, brown and white, signed Duval centre right, of oval form, watercolour on ivory, 8.5 x 6.5 cm, set in a rectangular wooden frame, 14.5 x 12.5 cm