PTT Linz :

 

this recording is from 1971, seldom heard that clear (rb)

 

a friendly verification letter (Maarten van Delft, 1964)
nice QSL-card as reward for a report (rb, 1971)

 

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Callsigns:
OEF **

 

Frequencies Voice:
5905
6787
7890
9130
13848
14490
16160
17560
17620
20775
23600
23765