The ECS-196.6-20-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 19.6608 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 20. Tags: Thru Hole. More details for ECS-196.6-20-1X can be seen below.