Sent by Heleen (the Netherlands), on 27th April, birthday of the prince.
It was made of a package with fresh orange ingredients for the Koningssoep (='King soup') invented for this 30th April, when the queen passed her job to her son (the first king since 1890!). I love the idea that Koningsdag (='King's Day', formerly Koninginnedag or 'Queen's Day') is an opportunity for Oranjegekte (='orange craze'): people decorate houses, cars, shops and entire streets in orange colour, wear orange clothing and even dye their hair! I must be there one year!
I love the festive decorations on the postcard. And did you noticed the royal stamps with the queens Beatrix and Juliana?