1959-D LMC ... Some Questions About It

Die chip. Noted

There were multiple of the exact same coins in the roll... so I actually have 6 of these exact coins. Is this normal?

Will do. Right now the 6 I pulled from this one roll seem to be darn near identical. I have 9 more rolls to go through, so I will update. Thank you

A die chip or break is a repeatable error. Every coin struck with that die will show the effect and its worsening progression until that die is removed from service.

Also extreme die wear on the devices towards the rim area. Just a common coin. Save for copper if your into that.

You could say that. Some of them, like BIEs, are catalogued as varieties as well as types of die cracks like Spike Heads.

I consider these errors because they are die failures caused by the striking process or an error in structural stability of the die metal itself from the beginning. While they are identically repeatable to an extent, they generally progress into larger breaks the more the die is used, so the "error" is unlike a design variety (say, Small vs. Large date) or a hubbing error (creating doubled dies) in that the latter examples remain the same until the die is retired. (Note: Die Deterioration affects all dies)

That's probably not a good explanation, but I do feel a line must be drawn somewhere. Even completely random errors can be repeatable to a degree. If something sticks to the die, then multiple coins it strikes will show the exact same, or very similar, effect until the problem corrects itself or the whole thing is shut down. A collar deployment problem could also cause several consecutively struck coins to have near identical errors.