Nazi group Walkyrie (I don't know what country); source: communication from José Luís Cepero. Jaume Ollé, 5 June 2000 and 24 June 2000
This may be a current flag used by the Golden Dawn Movement in Greece. (Other groups use similar ones.) Rick Prohaska, 30 January 2010
Good point: They do use a cross with a circle: Golden Dawn (Political organization, Greece). The snag is that the Golden Dawn Movement always uses a very Celtic-like Cross, so this may indeed be another group using it. Peter Hans van den Muijzenberg, 30 January 2010
