O’Brien Coin Guide: GB & Ireland Copper Farthings (William IV) 1831-37

William IV enlisted in the Royal Navy at the age of 13. He served in New York during the American War of Independence and George Washington approved a plot to kidnap him.

William's farthings are very collectible and a full set = 5 dates !
The varieties and errors are a bit more difficult to find.

https://oldcurrencyexchange.com/2018/01/05/obrien-coin-guide-gb-ireland-copper-farthings-william-iv/