Kembery Antique Clocks Ltd has dated this piece to the 1890s.

I have never seen such a high quality example of a Royal Polytechnic barometer. They are usually oak cased and paper/silver dials, this is mahogany and enamel dials.
Height 42 " / 107 cms Width 9 1/2 " / 24 cms Depth 3 " / 7 cms.
U.K. personal delivery only - please contact us for a quote. We are members of The British Watchmakers and Clockmakers Guild.
Kembery Antique Clocks Ltd has dated this piece to the 1890s.
You can view the stock and full dealer information on the Kembery Antique Clocks Ltd Profile Page