Revenue stamps of the United Kingdom
When Ireland was partitioned into Northern Ireland and Southern Ireland in 1921, separate revenue stamps were issued for both entities. Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps). However, Northern Ireland continued to use separate revenue stamps until the 1980s. Northern Irish revenues include Civil Service, Dog Licence, Excise and National Insurance stamps, among many others.
Outline of Northern Ireland
Northern Ireland was created as a distinct division of the United Kingdom on 3 May 1921 under the Government of Ireland Act 1920, although its constitutional roots lie in the 1800 Act of Union between Great Britain and Ireland.