G Ny Singapore :

 

no recordings available

 

here is a letter from 1973, giving many details (rb)
whereas this card from 1974 is very nice, but without any details (Frank Schüttig)

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Callsigns:
GYL
GYS

 

Frequencies Morse Telegraphy:
4334
6481
8630
12781
16928.4
18680
22521