It's the part with the brain. It's also very hard to do when he has his adamantium.

However, it's worth noting that the adamantium is toxic and his powers don't work as well while they're constantly fighting it, meaning non-metal Wolverine has regenerated from clumps of cells that no longer had a brain. This implies his mutation can both rebuild his entire body from scratch and that a brain isn't necessary either, BUT the largest cluster still probably was the only active one, otherwise we would have had multiple Wolverines growing from the cell clusters that survived brain death, so, to me, the more interesting question is what happens if you eradicate his brain and then cut the remainder perfectly in half?

One must assume it would indeed result in Cloneverines. It's only logical.

Not to mention the whole bones that can’t be broken because of the super strong metal.

So… pre bone infusion Wolverine maybe? Although if he lost an arm and it grew into a new person would they have a functioning brain?

For that matter, even if he didn’t, would a healed wolverine remember who he is if his brain suffered enough trauma?

Which opens up a Pandora’s box of issues such as CTE’s j side his encase skull. Sure his brain can heal that damage but the memories, etc would be gone right?

In Australia, they'll give you the fraction of the note value between 20 and 80% of the full value:

https://www.banknotes.rba.gov.au/damaged-banknotes/damaged-banknotes-policy/

Wolverine just isn't allowed to lose more than 80% 👍