Gold tone stamped Eisenberg rare koala brooch! Beautiful 😍 overall very good with orange 🍊 jelly belly! This is Eisenberg jewelry not Eisenberg ice. If you are looking to become a vintage collector Eisenberg is a great way to go because the marks are identifiable as well as the timeline! From circa 1935 to 1948, Eisenberg used a script or cursive “E” or “Eisenberg Original” to mark its pieces of costume jewelry. From 1945 to 1958, the bold all capital lettered “EISENBERG” mark would be found. After 1955, Eisenberg added the all important copyright symbol to its firm name mark to protect its designs from copyright infringement. 1950s to the 1970s, the firm changed to using an Eisenberg paper hang tag which often times makes it problematic to identify a mid 20th century Eisenberg piece. Eisenberg pieces are recognizable by its style, however, marks make it easy for collectors to confirm the authenticity of an Eisenberg piece.