The fact that German soldiers didn't have the best idea of what a T-34 looked like already cropped up on my blog. However, if they were equipped with identification guides like these, that isn't too surprising.
The caption reads "particularly suitable places to attach explosive charges and T-mines on the 32 ton tank". The weight is also incorrect, but prophetic: the mass of the final iteration of the T-34-85 reached 32 tons.