1930S Cent on small planchet

Hi folks,
I just bought a small collection from a guy and this was included. Not sure what I'm looking at so I thought I'd turn it over to the forum for insight. Here are some photos:
1939 is for size comparison...

 

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In strong acid for a while. Acid dissolves from every direction , so details stay proportional to original mostly, the thickness, weight, and the diameter will all be reduced. Jim

 

Also.. Dime planchets even in 1930 were not made of copper
As stated.. Acid dipped
Just a misidentified heading.

 

It shrank from washing it in water that was too hot??

 

what kind of acid would be used ?

 

If it was on a dime planchet it would be silver not copper.
You're lucky it's not a 1931-S.

 

PMD

 

Thanks all.