Earlier this year I received this nice e QSL Olympia Radio with call sign SVO. My report was for a DSC message on 8414.5 kHz. I sent my QSL to email@example.com . Like in many countries maritime or coastal radio stations in Greece merged into one station: Olympia Radio. Occasionally I do see other MMSI station identifiers popping up like for example Aspropyrgis Radio, but as far as I know everything is centrally controlled since 1998.
As said, in the past there were multiple radio stations. Athens (SVA) was the station operating on both MF and HF. Iraklion (SVH), Limnos (SVL), Kerkyra (SVK), Rhodos (SVR) and Chios (SVX) were operating on MF only. Of those Kerkyra was most frequently received in the Netherlands. Below you can see the QSLs I received in the 80-ies from Athens and Kerkyra Radio.