An ivory netsuke of a seated rat

An ivory netsuke of a seated rat
eating a nut -- 1in. (3.8cm) high, 19th Century, signed; another of a grazing horse -- 2in. (5.7cm) high, 20th Century, signed; another of a mask of Hannaya -- 1.3/8in. (3.5cm) high, 19th Century; and a stained ivory mask netsuke of a frowning Immortal -- 1in. (3.8cm) high, 20th Century.
See Colour Plate 2 (4)