We've not had a thread on "Mechanicals" ...
... so here goes!
Bonus! "Hilsen fra Kobenhavn" translates to "Grüße von Kopenhagen"
Bonus! The letter carrier's pouch opens to reveal a Souvenir Photo Foldout (SPF) replete with captions & perforations!
Edited to add: Postcard from the collection of Michael Lebbert.