The SK-105 was developed by the company named Saurer-Werk, as the Austrian Army needed a reliable tank destroyer. The very first prototype was built in the year 1967 and it the pre-production began in the year 1971. Around 286 were made for the Austrian Army and was in service until the 1990s, while the rest of the SK-105s were exported.

The hull of the SK-105 was based on the heavily armored car, Sauer APC, which was used alongside Austrian units. This allowed the tank destroyer to be light and have above average mobility, something the Austrian Army wanted. While the hull of the tank was an easy choice to make, as the Sauer APC hull required just a few modifications to be adequate for the standards set by the Austrian Army, the debate now was which turret should the SK-105 use. Since the Austrian Army wanted a cannon that was light, reliable yet still powerful enough to fulfill it's role of a tank destroyer, they turned their eyes towards France. Because of their massive success and mass production of AMX-13 light tank, the Austrian army decided to contact France in the hopes of designing a new turret. In the end, France agreed and came up with an oscillating turret that was light yet powerful enough to be used in an anti-tank role.

While Austria retired the SK-105, a substantial amount is still in service today in other countries: mainly in Brazil, Bolivia and Argentina. Argentina created the "Patagon" variant by merging a brand new hull with surplus AMX-13 (105) turrets, the result was a vehicle comparable to the SK-105 A1.

From War Thunder Wiki