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 young maiden’s face with flowers in herhair. The brooch is triangular in shape and measures approximately .875 inches in diameter. The brooch bears impressed marks for Unger Brothers, Sterling, 925. This brooch is in excellent condition.