Sorry, I can't tell if it's damage or a pontil. If it's a pontil you're right, if it's fractures or a chip it's machine made. This is what I can't quite make out.
Yes they R HTF. I had to wait a while for mine. Mint, I had several beat up ones in my hand but you get what you pay for and if I needed to sell a mint marble will be gone almost as soon as you post it. Patience, you'll find one