Help identifying BB/tool needed

So I stumbled across this BB yesterday when someone asked me to remove it. I can't seem to figure out what tool I need to remove it. It's a BSA BB made by KSS. It's on a Quintana Roo Mean Streak, though I have no way of knowing if it's the original BB.

I've tried googling but can't seem to find anything with a similar cup.

Thanks in advance for any help