D3MOS 1947 Deutschland

German Short Wave Receiving Station
Plauen, Saxony, Russian Zone
There was no amateur radio in the Russian Zone at that time.

The card is a typical standard print used between 1927 and 1939 by DASD (Deutscher Amateur Sende Dienst)
D3 was a general call from 1933-35, and afterwards for special stations.
Three letter suffix indicates an unlis station. We have no information whatsoever on this Op.
The QSL instruction "via DASE" refers to "Deutscher Arbeitersender Empfangsdienst"
(German Workers Labour Transmitter Reception Service) via DFTV, the "Deutscher Funktechnischer Vwrband" (German Technical Radio Society).
DFTV was the umbrella organisation for most of the local, regional, national clubs of broadcast listeners, radio amateurs, SWL-clubs etc.- from inofficial ("just getting together") to officially registered
(DASD was a member, but a registered club only after 1933).
As soon as 1918/19, the period of German revolution after the demise of the monarchy, and before (and during the early days of) the Weimar Republic, revolutionary councils ruled the streets.
There wre many Navy radiomen amongst them, and they tried to get hold and command the telegraph system - and when that failed they were at least fighting, from 1922, for a Labour Movement broadcasting station. This again failed when the government ruled that the PTT holds a broadcast (license) monopoly.
Thus the only remaining possibility to influence the broadcasting scene and "give the working polulation a voice" was to form an organisation to represent the "LAbour Listener"(Arbeiter-Hörer).
These organisations wer not part of or affiliated to the political parties, but close to their respective idiology.
The "Arbeiter Radio Bund Deutschland" ARBD (Labour Radio Society), established 1926 with a social-democratic tendency, split 1928/29, when the communist-oriented sections took over,
and the moderate sections founded "Freier Radio Bund" (Free Radio Society).
Both organisations were dissolved at  the Nazi takeover in 1933.
ARBD had an amateur section with most of the members also organised in DASD. They used three letter prefixes, ending with S.
The "Freier Radio Bund" included an "Arbeiter-Empfangsdienst" AED (Radio Reception Service), using DAE calls.
Both groups had a QSL Service of their own.
Now this D3mos must have been active unlis until 1933 with a "regular" DE-Call issued by DASD to identify him.
Cards sent to him were forwarded from DASD (within the DFTV) to DASE (also within DFTV). This was done by the central section Berlin.
After the war, the Op used his old QSLs and started unlis again. Since the pre-war organisations did not exist any longer he asked for direct QSLs, most probably with his address on the envelope.
Daring, but not yet really as dangerous as this would be only a few years later.
At the same time hams in the British-American Bi-Zone established the DA-System and foresaw DA8 calls for the Eastern Zone.
When amateur radio was legalized in the British-American-French Three-Zone, DK8 and DL7 was reserved for the Russian Sector.
A few cards indeed were handled between the "Ostzone" and West-Berlin. The GDR element was not amused, and consequently amateuer radio was legalized in the GDR in 1953.
It could well be that D3mos operated a DA8, DK8, DL8 or even DM2 call later. But we'll probably never know.

QSL G4UZN Collection
Info courtesy of OE1WHC