1958
See Wikipedia for what was happening around the world in 1958.
Here are some Old Time Radio episodes that aired in 1958:
Journey Into Space
Operation Luna [Part 1 of 12] see more episodes
1958-03-26 (11.41 MB) [24:55]
Yours Truly, Johnny Dollar
The Johnson Payroll Matter
1958-09-21 (5.53 MB) [24:10]
Plus 18 more episodes locked away in the Random Dispenser!