Unknown unit, late 1945?

JS-3 build – Part 1:Introduction
JS-3 build – Part 2:Assembly
JS-3 build – Part 3:Painting
JS-3 build – Part 4:Weathering (chipping, rust, wash, fading)
JS-3 build – Part 5:Tracks
JS-3 build – Part 6:Weathering (dust, mud, oil and fuel stains and finishing touches)