2016D - Harpers Ferry - Improperly Annealed

Pretty sure this is an improperly annealed 2016 Harper's Ferry quarter. Looking for second opinions and or correction if that is not the proper attribution. Hard to get true color pics, but it basically looks like a shiny dark chocolate quarter. Shows good cartwheel & bright edge reeding.

Edit: Regular quarter shown for comparison.

 

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I would probably guess environmental
Damage. Improper annealing usually leads to a bright copper looking coin, not dark.

 

Improperly anealed's are usually two sided.
Here is a Maya Angelo, I got as pocket change.

 

It still has full mint luster which I think is usually not the case with ED coins? Also it looks very similar to the OP's coin in this thread: https://www.cointalk.com/threads/2017-d-new-jersey-ellis-island-improper-annealing.307775/

 

The Third side usually tells the story.
An improperly annealed wiil 10/10 times show fresh copper.
Read a bit more on the striking procedure.

 

...This is my 2nd picture. In hand the copper looks freshly minted.

 

Let's see it!

 

You can't see it? I loaded 4 pics. I see all 4 on different machine than I posted from.

 

I don’t see copper. I see black, which points to ED, and not improper annealing.

 

You are presumably referring to the lack of copper showing on the surfaces, rather than the edge reeding my quote was referring to, no? As per error-ref.com "Copper, red, black, brown, and gray are colors typically found in these errors. Coverage can be complete or incomplete." So it seems black/charcoal is plausible. If it is ED I wouldn't expect the coin to exhibit cartwheel luster and fresh looking reeding. At least this hasn't been the case with any ED coins I've encountered, but I am clearly not an expert since I am the one asking here.

 

Regarding the edges, Fred Weinberg has posted a few times over the years that they should look like a freshly minted coin. This is due to the metal expanding into the collar and then having miniscule amounts scrape off from abrasion as the coin is ejected from the striking chamber. Remember, improper annealing is a surface effect, and the reaction with the furnace atmosphere does not penetrate much below the surface. You can think of it as "light toning" from a chemistry standpoint.

Environmental damage can be caused by so many things, I don't believe you can rule it out because the coin displays luster

The copper core on the edges of your coin, appear to be discolored. That would indicate to me that the coloration occurred AFTER striking. My opinion and reasons based on your pics

 

This is a classic example of environmental damage.

 

@Oldhoopster thanks for the helpful response! I considered Fred's comments regarding the reeding. I started this thread b/c in hand this coin looks very similar to the confirmed one in the referenced thread above. ...but consensus here seems to be ED, so that's fine.

 

Look at the rim, that's the best way to tell .

 

Where do I do that. Why would it look any different The third side

 

Old Hoopster told us about that earlier in the thread.
The third striking happens on the reeded edge, an improperly alled cent will show a red on the reeds.
If I am reading this wrong please correct me.

 

I believe you have the right info, but just to clarify,

the reeding of an improperly annealed coin will look just like a newly struck coin. If the copper layer in the reeding is discolored or toned, it is not an improperly annealed error.