Surface Mount Tuning Fork, clock signal, Low-frequency crystals, Tuning fork,

 CSM-7X Series 7.3728 MHz ±30 ppm 20 pF -10 to +70 °C SMT Quartz Crystal

https://www.futureelectronics.com/p/electromechanical--timing-devices--crystals/ecs-250-18-5px-ckm-tr-ecs-inc.-4171530