The Venetian glass pieces of this type are often difficult to attribute because there are several companies that made similar appearing glass. Sometimes these companies even worked together, marketing through a common outlet. The style of the glass is like pieces made by Salviati, Barovier, and Fratelli Toso. The style was popular in the late 1800s-early 1900s, but the traditional styles were often used later. If I were a guessing person, I would say there is a good chance it was made by one of the three mentioned companies sometimes between 1900-1930s, but without knowing your specific piece, it is just a guess.