"Perfect Pitch" is a phrase that has been around the music community a very long time and refers to one's ability to tell if a note is a C or E or whatever, without any reference. As far as one's ability to discern whether A4 is at 438 or 441, etc...I have never heard of this ability. Are you saying that you have (or used to have) the ability to hear A4 and tell what hertz it's at with a very high rate of accuracy?
This PTG archive page provided courtesy of Moy Piano Service, LLC