[Below: Greek envelope canceled on November 16, 1937 and sent to Scotland. Okay, not yet WW2, but it has interesting official tape. The top of this says 'Exchange Control' in Greek. This was currency control, basically controlling the importation and exportation of Greek money. The round reddish ink stamps say 'Currency Control Service - Thessaloniki'. Front.]

[Below: Back.]

[Below: Greek envelope canceled on December 22, 1937 and sent to England. Again, not yet WWII but it also has the currency control tape. Front.]

[Below: Back.]

[Below: Greek envelope canceled on ? and sent to England. Also with currency control tape, but with an additional large text ink stamp on front and back, which says 'Audited by the National Currency Protection Committee - Athens'. Front.]

[Below: Back.]

[Below: Greek envelope canceled on April 17, 1939 and sent to England. This is also before the war, but again has currency control tape. Front.]

[Below: Back.]

[Below: The real interesting thing here is revealed in the letter within. It has an 'Anglo-Egyptian Mail Line' letterhead. The 'SS City of Cairo' was a British passenger steamship. It was sunk by torpedos in WWII by German submarine U-68, killing 107 passengers. The British was using this civilian liner to transport war materials, as they so often did.]

[Below: Inside letter. The writer had some very odd handwriting. Click to enlarge.]

[Below: The 'SS City of Cairo'.]