The Neumann SM69 didn't use de-emphasis or a high-pass filter and used a K67-style capsule.
Because this microphone was mainly intended for 'distant miking', the theory was dat high frequencies would undergo a certain amount of attenuation as a result of friction with the air molecules.
As a result of this, the high frequencies would be more attenuated than the lower frequencies, that have more energy.
The air damping for high frequencies would act as a 'natural de-emphasis'.
(If you listen to a musical event on a distance, you will notice that you mainly hear low frequencies, this is the same effect.)
The U67 has a fixed high-pass filter, that can be removed by cutting a jumper wire.
It seems that everybody disables the high-pass filter, in order to obtain a better LF response.
Also, this has an influence on the phase linearity at low frequencies.
But even without a high-pass filter, subsonic frequencies are attenuated by the transformer.