Unger Brothers American Art Nouveau Brooch. This is an early 20th Century American Art Nouveau brooch made by Unger Brothers of Newark, NJ (1872-1910/1919). This sterling silver brooch features a relief of a female face emerging from leaves. The brooch measures 1.125 inches high by 1.5 inches across. The brooch bears impressed marks for Unger Brothers, Sterling, 925. This brooch is in excellent condition.