From Stamps of the World
Thessaloniki (Greek: Θεσσαλονίκη, AKA Thessalonica or Salonica) is the second-largest city in Greece and the capital of Greek Macedonia. It is a major seaport on the northwestern Aegean Sea. City population 322,240 (2011). After the Second Balkan War, Thessaloniki and the rest of the Greek portion of Macedonia were officially annexed to Greece by the Treaty of Bucharest in 1913.
Postmarks in Greece
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Postmarks in Austrian Levant Post Offices
The SALONICH (SALONICCO) post-office opened in 1777 and operated until 15 December 1914. SALONICHIO LLOYD between 1856 and 1880. A sub-office (SALONICH II) opened on 1 June 1895.