A 19th century satinwood strung mahogany five function, Mercurial, banjo barometer, thermometer by J. Grassi of Exeter. With swan neck and urn pediment. Second-quarter of the 19th century. 21cm diam dial.Condition report: Ivory setting knob missing, one scroll of pediment damaged.I can't open the rear door to assess the tube or cistern condition as it has been glued shut.The hub of the hygrometer is loose but present.