The Berlin Gold Hat is a Late Bronze Age artifact, made of gold leaf.
The general assumption is that the hat served as the insignia of dieties or priests in the context of a sun cult that appears to have been widespread in Central Europe at the time. Astronomical/ calendrical functions have also been suggested.
Out of the four European Bronze Age golden hats discovered, the Berlin Gold Hat is the best preserved. Each of these artifacts were rediscovered in the 19th and 20th centuries.
For those interested, Wilfried Menghin wrote an interesting segment on this artifact, The Berlin Gold Hat: A Ceremonial Head-dress of the Late Bronze Age; in Gods and Heroes of Bronze Age Europe, 2000, p. 172-175.
Courtesy & currently located at the Neues Museum, Berlin. Photo taken by Philip Pikart.