I was sorting out brass that I picked up in the woods. There was a bunch of Lake City .223 marked LC 08. When holding the brass to read the headstamp, I noticed that there is a "placeholder" for an indent or punch mark between the LC and the 08 on the lower part, as well as two sets of places to mark or punch on either side of the NATO logo. These "placeholders" are mostly shallow, with one or two of them actually being punched deeper. Then I noticed that the casings have different combination of actual indents. It got me wondering if Lake City has some kind of code for the month of manufacture? Anybody out there know something about this?