Charles III 50p: N#341998
I would also add that this specific coin reuses the reverse that was used on Elizabeth II's Coronation 5 Shilling coin: N#5749
Other than some very minor tweaking to allow for the difference in shape of the coin, it is essentially the same. The date on this coin is also divided by the Welsh leek. Given the 50p was an “In Memorium” type coin, it seems somewhat fitting not to adjust the original coronation design.
It is unusual for the date not to be on the same side as the monarch for a 50p, though there are a handful of other exceptions. The EEC & Battle of Hastings both spring to mind.