Hope the piccies will help you sort out Victoria's halfpennies. The mint really did have problems with the hardness of bronze when they started using it in 1860. I have 35 different examples dated 1861 with various dies, re-entered letters,dates etc.
This is the prize for everyone to look out for.............1875 Obverse 13* (Iain Dracott's designation). Found in 2005 and only 1 known at the moment. I bought it because it was a really nice example of reverse L, then found it was an unknown obverse
Merry Christmas to everyone....................Mal