This is a fun postcard from Sweden. Glad Pask! = Happy Easter, and those are witches flying airplanes over a city. Apparently Easter Witches are a part of Swedish folklore.
This card was signed by Hildur Soderberg, and I believe he did a series of these. This is the only one I have, but I'm sure I've seen others.
I'm not exactly sure of the dating on this card, but it looks early 20th century - pre-1918 - to me. There is a message on back (in Swedish I think), and it is addressed, but it was never mailed.
Update: This one sold!
