Antique French PNHB Holosteric Barometer

is an antique, PNHB, brass barometer made in France. it has the letters PNHB (not sure of the order) on both the front and back. T is some wear to the finish on the back. The whole thing could use a good polish. The glass is beveled. Not sure how or if the barometer works. It's currently pointing to "Fair", which is correct. Overall condition is very good. The barometer measures about 2&1/8" thick and 5" in diameter. Shipping is $8.00 within the USA. Insurance is extra.