no recording available
see here the multi-QSL version
from the collection of Rudi Renkwitz (2005), verifying RS-336,
RSY-378, SAD-348,
SF-283, SLB-414,
and SOK-387
in 2009, Bernhard Hein received
this nice multi-QSL for 6 NDBs: ASK-360,
BVK-362, HD-414,
SLB-414, SOK-387,
and UTH-366
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Callsigns:
SLB
Frequencies Morse Telegraphy:
414