A zinc cased Fisherman's aneroid barometer in perfect condition for its age.
Hand annotated enamel dial with the legends 'As Issued by the ROYAL NATIONAL LIFEBOAT INSTITUTION. No 17059. NEGRETTI & ZAMBRA. LONDON.'
Indicated pressure range of 26-31 inches of mercury, heavy bevelled plate glass and gilt tell tale. Manufacture of these instruments commenced in the last quarter of the 19th century. These are increasingly harder to find.  Measures 15cm diameter x 6cm deep.