2016 Quarter With Odd Coin Properties. Can You Help Please?

Lousy only in the sense that they're plated rather than pure metal.


This is PMD, not a mint error or sloppy plating.

@DBM if you has the link of numisma article for this kind I will like to read. Theirs site is so ambiguate and hard to find something except some descriptions of coins. Maybe to big database.

Now I will explain why it is PRE Striking default, not error coin or PMD.

I open a new roll of 25 cents from mint to verify the reedling. It is convex. The explanation of coin is that the reedling is soft on touch and almost flat.
I know the milling to day is double operation of milling and reedling. If the reedling rolls was at the end of life and the operator sleep, was change late.

Second: the reedling has Ni on the highest part and no abrasive traces. eliminate the polishing after strike. photo attached:


Third: The O and R of the coin show missing Ni on the low part of coin not only on the highest past=not happened before strike.

Fourth: To take out the Ni you need acid which will attack also the Cu. Here the scientific explanation: 



I look at the default coins for the symptomatic prospectus of metallurgical and chemistry point of view.
Grading, value, rarity and collecting desire you guys are the experts not me.

If I am wrong with pleasure I will accept the reality. For me is interesting coin from the cheap production and quality control. But accept that is cos 3 or 4 cents to produce and put in the circulation.

@Numisma. I like your point of view.

The coin is core steel-Ni-Cu-Ni. So if abrasive act after strike? why on the reedling parts you has in lower part those line? And how someone will be able to take out the Ni perfect circle near the rim? And how on O and R you has those missing Ni with irregular border. Even if you use 600 grit you will be not able to do those irregular border marks, abrasion leave almost strait marks.. My point of view.

Yep, the outer nickel plating is wearing off.

@John seem to be an acid clean coat of nickel. Probably with sulfuric acid. The cooper must show some very small round holes.

@ John. The multy ply is this:

1. First Nickel 10 microns
2. Second Cooper 15 microns
3. Third Nickel 5 microns.

You are right to keep for knowledge, I have to take out one 10 cent with the partial last ply plated for example purpose and to post. This I have direct from mint when I visit from scrap been plating. No extra value but education tool.