Today in Postal History

This cover was posted at Port Said where it received two Port Said Traffic postmarks.
I believe this is the postmark of mail dropped off from steamships.
The addressee also suggests that this may have been mail from
a crew member of a steamship, perhaps Karl Zelle writing home to his wife.

Its destination was Hamburg, the home port of much of the German merchant fleet.

The stamp is 20 milliemes ultramarine King Faud issued in 1934 (Scott 141).