General Post Office Postman's Cap Badge. United Kingdom.

Badge bears the St Edward's Crown above crossed post horns and a laurel leaf design.
The General Post Office (GPO) was the state postal system and telecommunications carrier of the United Kingdom until 1969.
Established in England in the 17th century, the GPO was a state monopoly covering the dispatch of items from a specific sender to a specific receiver; it was overseen by a Government minister, the Postmaster General.
Over time its remit was extended to Scotland and Ireland, and across parts of the British Empire.
The GPO was abolished by the Post Office Act 1969, which transferred its assets to the Post Office, so changing it from a Department of State to a statutory corporation. Responsibility for telecommunications was given to Post Office Telecommunications, the successor of the GPO Telegraph and Telephones department.