Based on the explanation here, I understand that if you electrically drive a tuning fork, you would first see a peak (resonance) and dip (antiresonance).
I just tested the frequency response of a tuning fork, which was designed with 10pF load capacitance in mind. I excited the tuning fork with and without a 10pF capacitor. I noticed the frequency position of the resonance did not change but the frequency position of the antiresonance increased, as would be expected from the wikipedia page linked above.
My question is the following: why do companies make the quartz tuning forks such that the tuning fork has antiresonance frequency of 32768Hz with the appropriate value of load capacitance?
Antiresonance shows up as a slight asymmetry in your amplitude plot, as can been seen in the black curve in the image below (B). Why wouldn't they design it such that the peak (resonance, marked as A in the image) is at the frequency of 32768Hz?
The resonance is definitely more pronounced than the asymmetry (antiresonance). Plus, it has the benefit of the frequency not changing due to load capacitance.
P.S. I just added screenshots of the plot of my actual measurement. You can see that the amplitude peaks at its series resonant frequency (also note the slight asymmetry)
Also note the dip of the parallel resonant frequency on log scale, and note the circuit diagram added.