https://www.omo-ic.com/blog/2012-06/through-hole-32768khz-tuning-fork-crystals-3696.html
Through-Hole 32.768KHz Tuning Fork Crystals | OMO Electronic
ECS Inc.'s tuning fork type crystals are used as a clock source in communication equipment, measuring instruments, microprocessors, and other applications.
tuning fork crystalsthrough holeomoelectronic