Philatelic bureau of the Greek post office.
Wikipedia page providing a useful overview of Greek stamps and postal history.
Wikipedia listing of people depicted on the stamps of Greece, with links to biographical data.
Scanned album pages from the worldwide stamp collection of Antonius Ra.
Scans of classic stamps of Greece in the Sandafayre Rare Stamp Gallery.
This exhibit comprises Greek and Ottoman postage stamps, which, following the progress in the advancing of the Greek Army and the liberation of Thrace, were obliterated as follows: (a) Western Thrace Administration, (b) Thrace Administration, (c) Thrace High Commission.