The stamp issued by Montenegro to commemorate the introduction of the calendar by Pope Gregory XIII in 1582 features a watch fob with a map of the Indian Ocean east to the South Pacific, including India, Indo-China and Australia. In the background is "1582" the year the calendar was introduced, "425" the number of yars between 1582 and 2007 when the stamp was issued, and "26" the number of seconds the Gregorian Calendar differs from the solar calendar in a year.