The ECS-73-S-5PX-TR 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 60. Tags: Surface Mount. More details for ECS-73-S-5PX-TR can be seen below.