The glacial erratic can be found between the town and the castle, near Struga Radzyńska (the Radzyń Stream). It weighs around 3.5 tons. A circle carved in stone visible on its surface depicts a coat of arms of Radzyń Chełmiński and contains a date “1593”.
This date probably refers to the privilege for small royal towns issued by the Polish king Zygmunt III Waza (Sigismund III Vasa) on 12th April 1593. The privilege aimed to contribute towards the improvement of the financial situation of such small towns.