Deffo not 1833 Rwork as it was a QV penny.
The bad news is that an 1833 coin will be VERY difficult to come across, as NO pennies, half pennies, sixpences or shillings were minted in 1833 during King William's reign

However I do believe 1833 groats exist (very rare), as well as Sovereigns and maybe farthings.
We can only hope for a foreign coin to fill the gap, such as a Quarter Anna, US Large Cent or something equally exotic.