NDB Røros *RS :

 

a recording made with the help of a 'Kiwi' in the region, revealing M-336 from Finland and RS-336 from Norway (rb, 2020)

 

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
Norwegian civil aviation offers 6 veries at once - and Rudi Renkwitz used it. Here for AL-398, BGU-316, BL-374, BTA-336, HE-324, and RS-336 (2009)

 

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Callsigns:
RO
RS

 

Frequencies Morse Telegraphy:
336

.