The design of the Panzer 58 started back in 1950 when the Swiss government quickly noticed that the AMX 13s that they had ordered were insufficient and that they needed a medium tank as well. The political situation all over the globe meant that getting a foreign medium tank would have been difficult, which meant that designing their own tank was necessary. As a result, they designed a 30ton Tank which was the great grandfather of the Panzer 58. This was first shown by me a few days ago in my article about the Swiss tanks, mainly the unknown projects.
The 30t Tank, the Great grandfather of the Panzer 58
This vehicle sadly never made it even though it would have been a mobile, well-protected medium tank with a big punch.
30 tons, with a 600hp engine, having a front hull with 65mm of armour at a 65° angle which additionally is sloped backwards to create a pikenose, very likely influenced by the IS-3s design. The turret armour is not listed at the front but from the blueprints measures out as about 200mm and 270mm at the gun mantlet.
根据相关历史记载：KW30T是58坦克的设计来源，58坦克设计于1950年代，当时瑞士认为AMX13系列坦克已经不能满足瑞士的国防需要，而当时的国际条件使得瑞士这样的中立国家使用外国坦克不现实，所以需要发展自己的坦克，不幸的是这辆坦克并没有量产，这辆坦克来源于KW30T系列，所以58坦克重量为30吨，600马力的发动机和可能模仿IS3制造的60度的倾斜装甲，炮盾正面装甲达到200mm，有记载他使用了90mm和105mm不同倍径的火炮：90mm L/62、90mm L/70、105mm L/60、105mm L/53。