1959
See Wikipedia for what was happening around the world in 1959.
Here are some Old Time Radio episodes that aired in 1959:
Have Gun Will Travel
The Colonel and the Lady
1959-04-12 (5.53 MB) [24:09]
Have Gun Will Travel
Stardust
1959-09-20 (5.52 MB) [24:06]
Plus 58 more episodes locked away in the Random Dispenser!