I agree, this looks like a nine.
Research MFC with nines --or others that were handgathered and you will get a better idea.
Many slags have "nines" and many different companies produced them.
A whole lot of them were machine made--it just they way of machine made marble production.
You will get a feel for them once you have seen enough of them.
I know that you will get there. Experience and "in hand" will tell the tale.
Keep on collecting and keep on learning---this is the way.
Marble--On!!