a clear morse code identification of the naval observatory (Willi
Passmann)
Maarten van Delft received
this QSL in 1965, an took a picture of the Naval Observatory
later in 1973
here the QSL folder (Hans-Friedrich
Dumrese, 1974)
this is a special edition for the observatory's 100th birthday
in 1981 (Tom Rösner)
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Callsigns:
LOL
Frequencies Voice: & Telegraphy
5000
10000
15000