I got this ½ Penny/2 Sou (N#2540) a couple of weeks ago.
I would ask if we could ask ruling authorities to the issuere? Thanks :)
It should be something like:
House of Hanover/Hannover:
- George III (1791-1820)
- George IV (1820-1830)
- William IV (1830-1837)
- Victoria (1837-1840)
Sources: