The 2S7 Pion or Malka is a Soviet self-propelled 203mm heavy artillery. "2S7" is its GRAU designation.
It was identified for the first time in 1975 in the Soviet Army and so was called M-1975 by NATO, whereas its official designation is SO-203. Its design is based on a T-80 chassis carrying an externally mounted 2A44 203 mm gun on the hull rear.
Wikipedia https://en.wikipedia.org/wiki/2S7_Pion
Official Website https://youtu.be/j-EJOVUFDqk
Coordinates 51°56'43.936" N 15°19'4.567" E