Frequency Control & Timing Devices, Oscillators, ECS-1612MV-500-CN-TR, ECS Inc.

 ECS-1612MV Series 50MHz 1.6x1.2mm 3.63 V SMT HCMOS Multivolt™ Crystal Oscillator

https://www.futureelectronics.com/p/electromechanical--timing-devices--oscillators/ecs-1612mv-500-cn-tr-ecs-inc.-3119269