What is going on with surface of this 1930 Buffalo?

That is correct, but if the tape is going to move/eat the surface of the coin, there goes your luster. It is not that the acetone will or won't do anything to the coin. It would be gone before you get to the acetone.

 

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I don't know her!

 

@jtlee321 What does the rim edge look like behind and below the feather? It looks awfully rough from what I can make out.

 

It is most likely a planchet flaw.

 

Look at the rim between 8 and 10 o'clock, and 2 and 3 o'clock, something happen there ....

 

Here is a map of the affected area. Some of the rims are affected, yet down at the bottom, there is a ridge that is not affected on the rim.

 

It looks like struck through but know idea what and how it could've made that pattern.

 

Your pictures are incredible by the way

 

That is a brilliant excellent if (whatever you call that and however you did it) the affected area in question Justin!

 

No, I meant the edge. Side view on the coin.

 

Somebody spilled Coca Cola on it - that crap will eat through anything, including your stomach lining! LOL!

 

Sorry, I miss understood you. Yes, there are patches of it on the edge, but not with the same texture as the obverse. It's slightly different.

This part of the edge would correspond to the top edge of the obverse. Above the Indian's head.

 

I did a quick and dirty focus stack shot of the edge with the obverse visible so you can see how the "odd" areas line up.

Edited to add a better focus stacked image.

 

Great pictures!

That is not what I was expecting. BTW, you say it is a different pattern. I am seeing a different pattern on the top of the rim in that area also.

I think that eliminates the planchet problem. How could the planchet flaw go completely through the coin but not show a whit on the reverse?

By the process of elimination, you must have a strike through. Apparently whatever it was got on the coin/planchet after punching and before minting. I have no clue what it was or where it came from.

 

@rlm's cents posted: "I think that eliminates the planchet problem." I agree. "How could the planchet flaw go completely through the coin but not show a whit on the reverse?" Easy, commonly seen as it happens all the time.
"By the process of elimination, you must have a strike through." I disagree. "Apparently whatever it was got on the coin/planchet after punching and before minting. I have no clue what it was or where it came from."

Now, @Treashunt I'm 100% sure. Liquid chemical flow all over the coin and edge = Chemical etching of some kind. IMO, if you try to slab it, you'll get a "details" grade of either "Corroded" or "Altered Surface."

I still want it.

 

Although I have seen numerous planchet problems (mostly wood grain) where the problem is only on one side, they do not have a side view showing the anomaly going completely through the coin. You say "commonly seen as it happens all the time." I will bet that you cannot show me a single coin with evidence that it goes completely through the coin but can only be seen on one side.

To copy you - I disagree! Again, any etching removes all luster. Think of an over-dipped coin and this coin has 10 times the etching but fantastic luster. Cannot possibly be etching.

 

Thanks. Yeah it's the darndest thing. But I really like it. Stuff like this strikes my fancy. When I saw it on eBay, I put on my watch list immediately and then put a strong snipe on it.

 

The etching I could see would be pre-strike as @Insider had said. Had the etching been deep enough it could leave a pattern like it has and because of it being struck and the metal forced to move, the luster formed, leaving the pattern behind.

 

That's the weirdest thing

 

Let me try one more. @mikediamond