Christkindl is an Austrian village outside the city of Steyr. Known for its church and religious artifacts, it is also home to a post office that uses a special postmark during the Christmas season. Mail sent in Austria with the "uber Christkindl" label attached (bottom of this cover) is forwarded to the Christkindl post office for special postmarks before being sent to its destination.
The postmark on the Christkindl label was produced by the Innviertler Briefmarkensammlerverein (IBSV - the Innviertel Stamp Club). They put out special Christmas postmarks each year.