Four Japanese wood mask netsuke 19th/20th century

Four Japanese wood mask netsuke 19th/20th century, one carved as an oni with one metal eye and stained tongue, another as a demonic man grimacing, with traces of gold and red lacquer, and two others of men, their faces contorted with sadness, all unsigned, 7.4cm. (4)

Provenance: from the collection of the 2nd Viscount Bearsted, and thence by descent.