one of the few flicks to attempt decent Tiger tanks
I assume they were mock-ups? A tad anachronistic since some tiger-looking tanks (they may be Panzer IV Ausf. 2 tanks, but even those didnt come till 1942) appear during the Barbarossa June 1941 segment of the film. It's too bad all they do is roll by in the background. A scene or two with a Tiger fighting off the T-34's (which they had at least a few real ones of those for this movie) would have really sold it to me.
I think the tigers were just wooden mock-ups seated on cars... like in DIE BRUCKE?