This paper model is a simple SU-85, a Soviet casemate-style self-propelled gun used during World War II, based on the chassis of the T-34 medium tank, the papercraft is created by oioid, there are 1:100 and 1:130 two scale versions.
Earlier Soviet self-propelled guns were meant to serve as either assault guns, such as the SU-122, or as tank destroyers; the SU-85 fell into the latter category. The designation SU-85 is derived as follows: 'SU' stands for the Russian: Samokhodnaya Ustanovka - self-propelled carriage, while "85" signifies the bore of the vehicle's armament, the 85 mm D-5S gun. For more information please click here.
You can download this papercraft model template here: WWII Simple SU-85 Self-Propelled Gun Free Paper Model Download