The 0.02c stamp is from Greek Islands issued in 2008 showing Xios Island.
Chios (Xios) island is a relatively large island in the East Aegean sea, situated very close to the western shore of Turkey. It is famous for the production of "masticha (mastixa)", and historically known for a great massacre of islanders during the war of independence. A not trustworthy tradition says that the poet Homer was born in this island.
The 0.70c stamp is from Greek Mythology issued in 2009 depicting Talos and the Dioskuroi.
Talos was a giant man of bronze who protected Europa in Crete, from pirates and invaders by circling the island's shores three times daily while guarding it.
Castor and Pollux, collectively in Greek as the Dioskouroi "sons of Zeus", were both excellent horsemen and hunters who joined the crew of Jason's ship, the Argo,which, transporting Jason and the Argonauts, approached Crete after obtaining the Golden Fleece. As guardian of the island, Talos kept the Argo at bay by hurling great boulders at it. Talos was slain either when Medea, the sorceress and the wife of Jason, drove him mad with drugs, or deceived him into believing that she would make him immortal by removing the nail.