Two-sheet set. See page 2 or close-ups of both pages above.
Exclusive to Alpha Stamps by Nichola Battilana.
In Nichola's own words: "Imagine waking up each day to find a card from the fairies helping you count down to Christmas! I've put together 25 miniature cards with vintage holiday imagery, numbered postage stamps and three envelope templates to fit the various sized cards."
More info in the blog.