here a recording made by finnish
online receiver (rb, 2017)
no pictures of QSLs or other info available
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Callsigns:
RN
WH
Frequencies Morse Telegraphy:
591
NDB Penza (*RN/WH) :
no pictures of QSLs or other info available
------------------------------------------------------------
Callsigns:
RN
WH
Frequencies Morse Telegraphy:
591