ECS Inc., ECS-3963-500-BN-TR, Electromechanical, Timing Devices, Oscillators

Oscillators from FOX, CTS, Abracon, Citizen & Saronix. Low profile oscillator. Oven controlled & SMT crystal oscillator, ceramic & clock oscillators. 

https://www.futureelectronics.com/p/electromechanical--timing-devices--oscillators/ecs-3963-500-bn-tr-ecs-inc.-3094111