A Kingdom of Scandinavia united with Sweden from 1814 until 1905. Norway's first postal service had begun in 1647, but this was little more than a means for the different parts of the country to report to the central government. However, after 1814 the postal service was reorganized independently of Denmark or Sweden. Postal markings were first introduced in 1845 when a cancellation was used at Christiana. These markings were extended to other towns during the next few years.
Norway’s first postage stamp was the 4sk blue imperforate, issued on 1 January 1855. At the same time a series of numeral cancellations were introduced to indicate the office of use. Numbers up to 383 are known and are eagerly sought by collectors. Norway maintained its neutrality during the period between the wars. Its postal service continued to develop on modern lines, a maritime coastal service was built up and an internal airmail service.
Despite a policy of neutrality, Norway was invaded by Germany early in April 1940; stamps were issued during the occupation, first appearing on 4 October 1940. These were demonetized in May 1945 when the country was liberated. The Norwegian government-in-exile in London issued stamps for use by the Norwegian navy and merchant service. This same set was released in Norway after liberation in June 1945. We highly recommend the stamp listings in Stanley Gibbons “Scandinavia” catalogue, also the excellent Norwegian listings FACIT “Frimarkskatalog Special” which includes information on early postmarks and other interesting philatelic areas.