Card, Stamp and even Priority sticker all Moomin themed!
Moomin is a comic strip created by Tove Jansson, and followed up by Lars Jansson, featuring their Moomin family of characters.
Little My (original Swedish: Lilla My and Finnish: "Pikku Myy") seen in this card, is a character in the Moomin series of books. She first appears in the fourth book: "The Exploits of Moominpappa".
She's a mischevious tomboyish little girl, who lives in the Moomin house and has a brave, spunky personality. She likes adventure, but loves catastrophes, and often does mean things on purpose. She finds messiness and untidiness exciting and is very down to earth, when others aren’t.
Check everything about the Moomin series here