Exhibit Antiques has dated this piece to the 1900s.
A 19th century glass decanter dating to c1870-1900.
You can find examples on page 404 of The Decanter An Illustrated History Of Glass from 1650.

Date & Origin
Italy, c1870-1900
Condition
Excellent, age-related wear as shown. The decanter has no chips cracks or restoration and is clean and clear. The stopper has a small section of the applied crimping missing.

Dimensions
Height: 22.5cm Diameter:12cm.
Historical Context
Around this time, Benjamin Henry perfects the Henry rifle which was manufactured by the New Haven Arms Company, and used in considerable numbers by certain Union army units in the American Civil War. Confederates called the Henry "that damned Yankee rifle that they load on Sunday and shoot all week!"
Exhibit Antiques has dated this piece to the 1900s.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page