The Caroling Series continues with the 3rd issue in a series of 4...the "Twelve Days of Christmas". The 2007 Caroling Mug features a design inspired by the 1864 lyrics of the classic carol "The Twelve Days of Christmas". With a pear tree, geese, and swans a swimming, this collector's plate also features a special backstamp which reads "Singing at Chrismtas is one of the most popular customs throughout the world during the festive season".