From Wikipedia
The early Military Miniature Series differed from the western standard scales of the time and used 1/35 scale. The models included the option for the inclusion of batteries and a gear box for motorization. These models were easy to assemble, the completed models looked good, and the parts were accurate. These qualities gave the series a good reputation ever since it was released. However, the option for motorization meant that the models needed to be inaccurate in some respects in order to work as motorized kits. More scale-accurate products which did not allow for motorization were renewed after the Tiger I's later model.