During the UNESCO World Radio Day event of February 13th, 2023 a special HAM station was in the air. I received it in CW on the 14 MHz band. It was a long time ago that I decoded CW, but with record/play back I was able to collect sufficient details for a QSL of 7S6WRD Grimeton, Sweden.
My guess is that the station normally operates as SK6SAQ (with SAQ identical to the Grimeton callsign) but was under a special 7S6WRD callsign for this event (with WRD obviously referring to World Radio Day).
Click the link to learn more about the Grimeton World Heritage Station. No doubt there will be future opportunities to receive this station and associated HAM radio.

Special HAM QSL for 7S6WRD Grimeton on World Radio Day