This is a lovely antique Baccarat crystal decanter.
In the Baccarat's catalog of the year 1840 !!
Dimensions:
Hight: 21,5 cm ( 17,5 cm without the stopper)
Diameter: 8 cm
Period: 1840 - 1860
No signature before1936
PERFECT CONDITION, no white spots, genuine stopper.
Here is a converter inches / cm to help you with the dimensions: