The ECS-39-17-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 3.93216 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 17 pF, Equivalent Series Resistance 100. Tags: Thru Hole. More details for ECS-39-17-1X can be seen below.