The ECS-73-S-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 7.3728 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 40. Tags: Thru Hole. More details for ECS-73-S-1X can be seen below.