I like that there are variations with the 1799. I have 3 - 5 incuse gunports (which seems to be the most common), 7 relief gunports and plain hull. The best is probably this 5 incuse:
Yes, that's an attractive halfpenny, and a unique type (the first regal halfpenny since 1775, as there wasn't a cartwheel halfpenny in 1797 sadly; then there was a gap until 1806 when a new smaller design was issued). I've always liked that single year type too.