Just ran across this news update. This is the weekend that the Girls und Panzer OVA is being shown in Japanese theaters. Along with the OVA there were teasers shown of the upcoming movie. The full article is here on Crunchyroll. Does anyone recognize the tank Nishi Kinuyo is commanding? Riveted armor with an offset turret seems like early WWII. I haven’t found any other information on what tanks Chihatan (their opponents) use or if there is a specific country they are supposed to represent. Movie appears to be after the Nationals since they show the Anglerfish tank with it’s upgrades.
Update: I’m guessing that the tank is a Chi-Ha Type 97.