£85
Antique Period Sterling Silver Hot Air Balloonists Pocket Barometer / Altimeter. Measures 48 mm Diameter. The Dial Includes an Altimeter Which Measures up to 4000 Feet, The Dial Also Included The Words Compensated Which Means That This Barometer Adjusts the Reading for Changes In Temperature, Giving a More Accurate Reading. Hallmark for 1920. Working Order with Box.
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