One of the two alternative designs produced for the German MBT 3 project. Here is the other one:
![](http://www.panzerbaer.de/types/pix/bw_kpz_leopard_3_vt_2_augustdorf-1315.jpg)
![](http://www.panzerbaer.de/types/pix/bw_kpz_leopard_3_vt_2_augustdorf-1313.jpg)
This was an earlier development vehicle
![](http://topwar.ru/uploads/posts/2012-06/1340422036_Leopard-3-4.jpg)
![](http://topwar.ru/uploads/posts/2012-06/1340422074_Leopard-3-8.jpg)
Similar to the Swedish S Tank. Initially tried with 105mm and then 120mm guns, and relied on turning the tank for aiming, although, unlike the S Tank, they were elevatable, independent from the tank chassis.