Once used brass question:

[esaabye]

None of my lc brass shows those 4 deep crimps nor the round marks.

[Great-Kazoo]

None of my lc brass shows those 4 deep crimps nor the round marks.

That's because you have different year LC brass. I have mixed years of LC and only the 2012 has 4 way crimp. The Circle Cross is Nato spec / marked. You see it on some 9mm like S&B and a lot of late 80's 308, like Cavim , SA etc.