A small pivoting mirror plate on a stand, made to sit on a dressing table or chest and be tilted to whoever was sitting at it, commonly over a base of little drawers for combs, pins and cosmetics.
Silver-framed examples on Sellingantiques carry London assay years - 1889, 1895, 1896, 1900, 1903 and 1904 - so they're dated by hallmark rather than by eye.
