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JG are the initials of Julius Gischard, the maker in Germany. The scale is atmospheric pressure read in inches of mercury. Lower pressure is indicative of poor weather conditions. Love it- nice find.
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MAGA Patriot WWG1WGA Q IdoNOTconsent I ❤️Life, Animals, Adventure, Freedom &Justice- Despise Evil,Corruption,Pharma,Monsanto,Stupidity
In response Miss Wide Awake to her Publication
I know nothing about antiques or selling but several hundred dollars for a nice shiny new barometer $5-800+ of a different type. Similar to yours but more beat up are going for $35-50 on ebay.