In my experience, AKG has never released Golden Gate-painted CK12 capsules in as sloppy a condition as yours. It's most likely an aftermarket attribute, which may also point in the direction of the 6dB gain loss compared to other CK12, which, for a stock capsule, is extreme.
The capsule would need to be taken apart to analyze whether all of the components are genuine AKG, period- and model-correct, and assembled correctly.
P.S.: Do I assume correctly that with "quieter" you mean "lower in output"?