1999 Kennedy Half Dollar w/ Connecticut (or ?) reverse over strike

I am new to the forum, although I have been reading occasionally as a guest for years.

This was found in circulation several years ago and I am wondering if anyone has seen similar examples? I have not found many 1999 errors listed at all, but am wondering if you folks would give me your thoughts on what I have and whether you think it's a true error or something else?

Thanks in advance for your help!

-SS

 

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I not sure what it could be but it is definitely not a Connecticut reverse struck on a half. A half will not fit into a chamber striking quarter. Looks similar but that is not what it is.

 

What you see is some sort of damage after it left the mint. Could be chemical, heat, electric arc, or who knows what. I don’t believe it’s a defective planchet.

Your 1999-S is a proof only issue. Proof coins are struck on specially prepared planchets and are inspected so the chances of a defective planchet getting through are slim. In addition, they are struck multiple times at higher pressures. The metal flow during striking would not leave this type of void on the field and devices, but environmental damage could. Sorry, but not a mint error

 

Acid/chemicals on the surface

 

Thanks so much for the response, this was very helpful. I've scratched my head about this coin for years, and have wondered -- if this was damaged after it left the mint -- why the "T" in the depression area is unscathed, and that the lines from the depression area flow up onto the neck. Could someone have created a die/jig to stamp this pattern on Kennedy halves (perhaps) as a statement?

Thanks again for the help!