Proclamation of accession of George V
George V was proclaimed King of the United Kingdom and the British Dominions, and Emperor of India, after his father, King Edward VII, died in the late hours of 6 May 1910. He was proclaimed king the following week, the first proclamation taking place on 7 May 1910 at St James's Palace.
Source: Wikipedia — Proclamation of accession of George V (CC BY-SA 4.0)