Here is an airline issued label from TAE (Technical and Aeronautical Exploitations Company).
Technical and Aeronautical Exploitations (Greek: Τεχνικαί Αεροπορικαί Εκμεταλλεύσεις) (T.A.E.) was a Greek airline formed in 1935 by Stephanos Zotos. It flew domestic routes until the German invasion of Greece in April, 1941 destroyed the fleet. T.A.E. resumed service after the end of World War II and flew DC-3 Dakotas until 1951 when the Greek government forced the consolidation of three extant airlines into one new nationalized airline which was called TAE Greek National Airlines.(wikipedia).
Year: 1956, Gummed. Günter Mair's catalogue no: - GRC-B-7, imperforated, dark blue/light blue or light grey-blue/white, 4****