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]
Yours Truly, Johnny Dollar
The Really Gone Matter
1959-08-30 (4.59 MB) [20:04]
Plus 59 more episodes locked away in the Random Dispenser!