the 300th anniversary of a precursor mail route that ran from Stockholm to Hamburg. These and subsequent Swedish issues were usually issued in both booklet (or sheet) and coil form. During the 1920s, the 1920 definitives were gradually supplanted by a new series with a 3/4 profile of Gustav. In 1924, the Universal Postal Union celebrated its 50th anniversary and its Congress was held in Stockholm, so Sweden issued two series marking it, the first with a view of the Stockholm skyline, and the second with two designs; a postrider watching an airplane, and a carrier pigeon over a globe. Both sets were primarily aimed at collectors, but are nevertheless prized today. Another major commemorative set in 1936 marked the 300th anniversary of the postal service with 12 values each with its own design noting some aspect of Sweden's postal history to date. In 1939 a new series used a profile of Gustav for lower values, and the Three Crowns for higher; the crowns design continued in use into the 1960s. Meanwhile, the pattern for commemoratives was to issue about 3-4 each year, typically a single design in two denominations, with the lower value available in both booklet and coil form, and the higher as a coil stamp only. Gustaf VI Adolf appeared in profile from 1951 on. Czesław Słania began doing engraving for the post in 1959, and so became well known for work of exceptional quality. The definitives of 1967 were a major departure from tradition. Instead of portraits of the king, the 18 designs encompassed a wide variety of subjects, including wildlife, scenery, daily life, history, and legend, each realized in radically different styles. See also Joint issues of Sweden Swedish Philatelic Federation Sources Stanley Gibbons Ltd: various catalogues Encyclopaedia of Postal Authorities Rossiter, Stuart & John Flower. The Stamp Atlas. London: Macdonald, 1986. External links http://www.posten.se/ - Official Swedish postal site (and in English) Official list and images of current stamps Links to Swedish postal history resources Philately of Sweden Postal system of Sweden