a recording from 1970, made
by Rudolf P Gröger
they always had nice QSL cards, here 1976 (Frank Schüttig)...
...this one from 1982 (rb)...
and another one for Frank Schüttig (2005)
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Frequencies Voice:
2863
2965
2980
5519
6676
6679
8828
8903
11387
13282
13344