OK for a Russian armor moron, tell me what you're talking about Factory 112 and Factory 174?
No such thing as a moron.
During WWII, the T-34 was mostly assembled by three factories. Factory 112, 174, and 183. As they were separated, each did their own modifications. I consider Factory 112 to be ahead of the game. Some remember the Stalin works factory (STZ) which kept producing tanks while the Germans attacked the city. But I am interested in the T-34-85.
After the war, the government decided to standardize the T-34-85 using Factory 183 as the example. This is why Czech and Polish produced T-34-85 are close to it in appearance. The upper rear armor plate rests on a ledge created by the lower rear armor plate and there are small hinges.
Factory 174 was similar in the rear armor plate arrangement but used two larger hinges which were very similar to the hinge used on the circular transmission access hatch:
Factory 112 had the upper rear armor overlapping the lower rear armor and two large hinges:
Of course, looking at the armored covers over the drive gears (semi circular items at each end of the lower rear armor plate) shows differences as do the driver's hatch, hand holds, track pin return bumps, and bow MG armor.
Turrets also have differences. Factories 174 and 183 were similar to each other and had a short roof plate. Factory 174 sometimes used a rolled steel (not cast appearance) on the commander's cupola. Casting seam on the 174 angled upwards near the front while Factory 183 had seams at right angles.
Factory 174
Factory 183
Roof plate on both do not reach the trunnion:
Factory 112 had a long roof plate which reached the front
Factory 112 also produced turrets with separate 'mushroom' vents during 1945. This is why the one found in Serb colors is an issue as it has mushroom vents but a short roof. This makes me believe it is a Factory 174 turret slowly incorporating the standardization but taking the separate vents prior to returning to the twin domes.
Regards,