PTT Warszawa :

 

here is the voice mirror used in 1971, a little bit disturbed though... (rb)

 

verification with a friendly letter (rb, 1970)
Polish PTT later used nice picture post cards for QSLing (Frank Schüttig, 1975)

 

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Callsigns:
SOE ***
SOF ***
SOG ***
SOH ***
SOI ***
SOJ ***
SOK ***
SOL ***
SOM ***
SON ***
SOO ***
SOP ***
SOQ ***
SOR ***
SOT ***
SOV ***

 

Frequencies Voice:
6980
7404
7835
7865
7894
10278
10497
11418
11425
13785
13793
13963
16200
18995

 

Frequencies Morse Telegraphy:
6985
7897
9298
10694
11423
11425
11444
11533
11535
18993.5

 

Frequencies Radioteletype:
4027
4494
4514
4625
4630
4635
4912
4932
4945
4962
4977
5063
5075
5130
5290
5300
5393
5430
5800
5829
5849
5903
5944
6792
6975
6980
7694
7725
7845
7975
7987
7997
8001
8081
9046
9087
9164
9298
9890
10153
10228
10245
10494
10694
11418
11423.5
11494
11600
12007
12185
13602.4
14500
14914
14917.5
15558
15983
16200
17492
17600
17680
18135
18390
18425
18535
18610
18993.5
20068
20165
20505
20888

 

Systems used:
50 Bd
FEC-A-96