I wish to paint a 1/6 scale model to depict a tank of !st Guards Tank Army at the time of the Battle for Berlin. I have found a number of photos but am not sure that the captions are accurate and cannot identify the tanks' Units from the -usually 3 digit numbers - on the turrets. Can any one direct me to a reference source or website that explains the Soviet system of tank numbering? Can any one indicate a photo where the Unit or even crew can be identified? Some books contain the same photo of a tank number 252 but disagree as to the year and location. Any one able to give a definitive verdict? Here's hoping!