I picked this up today in a lot of other marbles. It's an amber slag, 11/16". To me, the 9 on it says MFC or Akro, but the seam leads me to CAC, so I don't know what to think. Any help?
Thanks. I think you're right. I'm not very familiar with slags other than akro and later pelts, but I think some MFCs had cut lines like this one does.
They all have shear marks. Some more pronounced than others. Some got more smoothed out when they were on the rollers. Harder to spot if there is clear where the mark is.