You are looking at an m f antique brass curved glass thermometer/barometer. It is 5 1/2 across and 2 1/4 deep. I dont see a break but dont see any mercury and i do not know if the barometer works. The inside could use a light cleaning.
The item “Rare Brass Antique M F Round Curved Glass Thermometer Aneroid Barometer” is in sale since Tuesday, April 29, 2014. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “treasureseeker24″ and is located in Cedar Rapids, Iowa. This item can only be shipped to United States.