The ECS-18-13-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 1.8432 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 13 pF, Equivalent Series Resistance 750. Tags: Thru Hole. More details for ECS-18-13-1X can be seen below.