Weird Blank planchet with strike

I found this coin blank while searching a jar of coins and I’ve found many blanks before but nothing like this. Any help appreciated!

 

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I don't think that's a coin planchet.

It's smaller than the Cent and a Dime

 

Not a planchet, in my opinion. Maybe a piece of a necklace/jewelry that got tossed into the jar since it was round.

 

Glad to help.

It is a weird blank round Thingy with a Match Strike.

 

What time is the smallest coin we currently have in circulation and your copper piece looks smaller than a dime. I do not think it is a coin blank.

 

Looks like a corroded button type battery.

Z

 

Spell check changed my words again. It should read the Dime is….

 

So I work in the hvac trade and that looks like a cap from the end of a copper plumbing pipe that has to be heated up to remove it it keeps debris from getting inside but that's my guess I've seen them laying around new construction job sites

 

I want to add this jar of coins came from an auction and the guy who's belongings were up for auction worked as a millwright at a company that produces blanks to supply the mints. They also made foreign coins.