The Carl Zeiss Standard Primes are 35mm format f2.0 lenses developed by Carl Zeiss for ARRI (then Arriflex), and predate the original Zeiss f1.2 High Speed series (Super Speed in the U.S.).

It is likely that this set was just called something like the “Zeiss Primes for Arriflex”, and once the High Speed lenses were introduced in 1975, they became the “Standard Primes”.

When introduced, the Zeiss Standard Primes had the original Zeiss single layer anti reflective coating and were marked as T2.2 except for the 16mm which was a T2.4. In the early 1980’s an updated version of the Standard Primes Mk. I was made with the T* multcoating(same as on the Super Speed lenses), and these lenses are marked at T2.1, except for the 16mm marked T2.2.

Now all of them are rehoused, they should work for another decades.