VK7BC 1946 Australia

Here is a QSL from an amateur broadcast station, 7BC (these were rarely heard overseas, except in New Zealand).
Note the frequency of 1210 Kcs in the AM broadcast band. When Australia restacked its AM stations from a 5 KHz spacing plan to 10 KHz spacings on 1 Sep 1935, many amateur broadcasters had to change frequencies to align also.

VK1DXA Collection