I think mostly copper.
Such a coin does not exist. George V did not become king until 1910.
King George (Georgivs is a latinized version of the name)
King George V wasn't on any coins until 1911.
The words Georgivs II Rex on a coin (or similar) would translate as George the 2nd King, or King George the 2nd if you prefer.
Georgius VI, or King George VI, is depicted on the Canadian penny. He was a man and served as the king of the United Kingdom and the British Commonwealth from 1936 until his death in 1952. The Canadian penny featuring his image was in circulation until it was discontinued in 2012.
George III, the King of England from 1760-1820.
Part of the Latin title of King George V, commonly used on coins. GEORGIVS V DEI GRATIA REX ET IND IMP means, GEORGE V BY THE GRACE OF GOD KING AND EMPEROR OF INDIA.
The British penny that you refer to has a portrait of King George the Sixth on the front and a picture of Britannia (which is meant to be a personification of Great Britain, much like "Uncle Sam" is a personification of the United States) on the back. By the way, the phrase "GEORGIVS VI D:G:BR:OMN:REX F:D:IND:IMP." is abbreviated Latin for "George the Sixth, By the Grace of God, King of All Britons [or "Britain"], Defender of the Faith, and Emperor of India."
A coin marked with "GEORGIUS" or "GEORGIVS" could be any British, British Colonial or British Empire/Commonwealth coin issued during the respective reigns of any of the six King Georges. George (I)(1714-1727) George II (1727-1760) George III (1760-1820) George IV (1820-1830) George V (1910-1936) George VI (1936-1952)
King George IV did not take the throne until 1820 and there was no 1773 British Penny minted.
King George V
King George V