Swedish Ocean Sailing Club (SEA) :

this is a voluntary service with different stations throughout Sweden

 

here is a recording in english and swedish was made by Nils Schiffhauer in 2015

 

Dieter Pohlmann received this very informative letter ogether with his QSL in 2015
this QSL-card is from the collection of Patrick Robic (2016)

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Callsigns:
SEA **

 

Frequencies Voice:
4149
6224
6230
8294
12353
12365
16528
18843
22159
25100