1983 LMC With Unidentifiable Doubling Effect One The Reverse.

Let me start out by saying I apologize for seeming to be snippy or ignorant of the rules for posting. That was not my intention.
I was under the impression that questions regarding this aspect of numismatics did not "always" require a complete and full description of the specimen in question.
Having already eliminated the possibility of known examples of DDR, I was simply hoping to get a reasonable explanation for what I was seeing not being influenced by the particular coin in question.
MD was eliminated.
DDD was eliminated.
Split Plating doubling was eliminated.
Post strike damage elinated
Stiff die fill(grease) eliminated.
Before the previous post was locked, makescents offered at least an opinion as to what this was. Called it as an 80's nailed it as an 83. Perhaps he can elaborate on this thread.
If his hunch is correct concerning a sunken reaction in the center of the devices is plausible, how often would this be discernable in a given mintage of year or any other? He says it has never been fully explained to him, just conjecture.
Since it is required to identify the specific coin in question and provide full images for any question, I cuncur.





A decerning eye will notice that this is not the same coin in the locked post. It is another just like the original pulled from about a 150 83's.
Jeez ya'll, I'm just trying to learn here