Negretti & Zambra Pocket Barometer, c.1920
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A rare weather watch forecasting pocket barometer by Negretti & Zambra, No R/105 c.1920, the 2' silvered dial with three concentric scales, set by rotating the front and rear bezels and the crown winder. The resultant readings appearing in alphabetical codes to three apertures to the central dial and relating to an alphabet key engraved to the rear of the lacquered brass case.
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