Possibly from 1960-1980, based on search of pattern

Not having served myself, I tried looking into this history. I believe the helicopter is military, possibly the icon for the Bell AH-1, or Huey, as I've known it to be called. I'm not sure if Cobra is the name of the radar system company, or for the model Cobra of the Bell AH-1.

Either way, it's a fantastic and rare memorable piece!

Some age wear on the brass.