Victorian Christmas Hot Air Balloon German Advent Calendar by Richard Sellmer This beautiful advent calendar was manufactured in Germany by the Richard Sellmer Verlag Company. This new paper calendar is about 10.5 inches by 14 inches. The tradition is to open one door each day from December 1 thru December 24. Children love to open a door a day as they count down to Christmas. This calendar has glitter The detailed picture has 24 little doors to open. Each door has a little picture behind it.