The dial is hand enamelled. and is signed:
"Negretti and Zambra, London, # 9708"

c.1900
working order
diameter 9" x 3" deep
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The makers are listed as follows:
The most prolific and leading makers of all types of barometers in the 2nd half of the 19th Century.
Established since 1978, dealing in and restoring most antiques, specialising in clocks and furniture.
You can view the stock and full dealer information on the Worboys Antiques Profile Page
Worboys Antiques is a registered member of LAPADA