The Swiss Army ordered from the company Eidgenoessische Konstruktionswerkstaette "K + W Thun" ten of these vehicles, which were produced between 1972 and 1974.

The whole tactical equipment was removed, under the tower a platform made from aluminum was installed.

The tank was usually only used with one crew member, the driver, although there was enough space for an observer or a commander.

The vehicles carried the identification numbers (M-numbers) "M77870" - "M77879" and were from 1974 to 2007 in the service of the Swiss Army.

The tank with the number "M77876" was stationed on the shooting range Les Rochat and is now in the Military Museum Full.