PTT Berlin :

 

this recording is from 1971 - showing also some of the instabilities of past times receiver's SSB reception possibilities (rb)
Here is a recording of better quality (Rudy van Dalen, 1981)

 

see here a QSL, where text-side of the broadcast-card ('Nalepastrasse') has been changed and used additionally to the other card (Maarten van Delft, 1963)
this is a slightly different version: PTT's own card ('Agastrasse') (Lars Lundström, 1964)
a nice view-card used for QSL (Frank Schüttig, 1975)
different version of the QSL-text (rb, 1984)

 

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Callsigns:
DAV
DKA
DKC *
DKD *
DKE *
DKF *
DKG *
DKM *
DKO
DKP
DKR
DKU *
DKW *
DKZ
Y2H *
Y2J
Y3A *
Y3B *
Y3D *
Y3G
Y3H *
Y3I *
Y3J *
Y4A *

 

Frequencies Voice:
11125
13375
14975
15595
16398
17520
17620
17635
18535
20060
20077
20140
20500
22950
23400

 

Frequencies Morse Telegraphy:
5868
9420
9920
11600
13950

 

Frequencies Radioteletype:
4010
5135
7784
9047.5
9124
10126
10210
10440
13785
13925
17520
17620
17635
18470
18547
19947
20077

 

Systems used:
50 Bd