The exact starting date of the glasswork cannot be established.
According to Esperia Mazzega. Daughter of Romano, it goes back to the early 30s. In 1937 Romano sold the firm to Aureliano Toso and the following year, together with his brothers Gino and Maria, he established the F.lli Mazzega
After the Second World War this name became I.V.R. Mazzega.
The glasswork operated mainly as a commissionaire, especially for the Fucina degli Angeli firm, having the best artist and glassblowers of the time, such as: Ermanno Nason, Luigi Scarpa Croce, Aldo Bergamini, Fulvio Bianconi, Carlo Scarpa, Renzo Burchiellaro, Anzolo Fuga, Marc Chagall, Pablo Picasso, Gio' Ponti, Georges Braque and Jean Cocteau.
Production stopped in 1983.