Quick history: developed in 1945, after the ISU-152 based on the IS-2 heavy tank. Only one vehicle was made. Chassis of the IS-3 heavy tank was used and fitted with the 152 mm ML-20S anti-tank howitzer.
My LEGO® version is fitted with the 152 mm BL-10 which was also used on the ISU-152 but after all the ISU was the only one of the two that got the BL-10 fitted.
Yum! Very pretty, and a fairly rare tank to see in Lego. That BL-10 just ruins my poor KV-4's day. Pens every time and takes half my health. KV-4 does not like tier 10 TDs. Great build, excellent sloping!