Logic clock, timing chip, Timing Device authority

A broad stock offering of crystals in both series and parallel resonant values.  You can find a wide range of stability values from industry standards of 50/30ppm to tight stability offerings of 5ppm on some watch crystal packages.

https://www.futureelectronics.com/p/electromechanical--timing-devices--crystals/ecs-327-12-5-34b-tr-ecs-inc.-4044802