Technically interesting French watch with barometer Circa 1890

Gunmetal open faced cylinder watch
–
A technically interesting French pocket watch with barometer, circa 1890. This watch has a gunmetal case and is equipped with a cylinder movement that incorporates a barometer. The central dial features a white enamel finish with Roman hours, outer minute divisions and moon hands, the barometer chapter ring is positioned on the outermost edge and labelled Montre Barometre BTe S.G.D.G. It is in pristine condition and considered highly uncommon.
–
Diameter: 56 mm
–
Weight: 110 g
–
Signed: No name