If not, read more about it here: Google Translate of my Polish post about this neglected national treasure.
It is not the only object proving the antiquity of the Wheel symbol in the Indoeuropean (Polish) culture. In 2008 another ritual wagon (chariot) was discovered near Wrocław - the Domasław treasure from 600-800 BCE:
visit the newest exhibition in the Archeological Museum of Wrocław, until 15 FEB 2014.
Here are some photos I took thereof (click me for more) :
|Domasław Treasure pot|
|Domasław Treasure sun symbol|
|Domasław Treasure ritual wheel|
|Warhammer, pre-Lusitian culture, 1300-1600 BCE|