Three Chinese lozenge-shaped incense burners 19th/20th century

Three Chinese lozenge-shaped incense burners 19th/20th century, each raised on four feet and with flanges to each end, the largest with rectangular panels containing figures in a rocky landscape separated by shou characters, raised on a base with auspicious things and key fret, the smaller two a pair, cast in relief with taotie masks, the latter each with a cover, 33.4cm max. (6)