I agree with Steph.
The thing with Akro is the cutline does not always follow the stretch of the colors to a point; you may be able to discern a “C” type cutoff beyond the colors pointed end in the matrix.
Generally Master Made Marbles do cutoff to a point with the colors—generally at least.
This is the way for me. Most will be right—some—maybe not but if I cannot tell, who cares really.
Then you get into Master Glass Marbles which may have been using Akro Machinery. We will find out some day.
Marble—On!!