1973 penny error or pmd?

Can someone tell me if this is pmd or some type of error. Thank you

 

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I was going to say PMD, and then I saw the reverse. I'm speechless. I've never seen a coin that resembles a knotted tree. Sorry I can't be of much assistance, but I believe it is PMD. The more experienced will chime in at some point, don't worry.

 

Thanks for the response. I can't seem to get a good picture of the rim, But looking at the reverse its pretty much normal thickness except at 5-6 o'clock its gets thin. 7 o'clock returns to normal thickness with another thin spot at 9 o'clock then back to normal thickness.

 

I'd say either acid or extreme heat. pmd

 

My guess would be heat exposure, but damage nonetheless.
Keep up the hunt!

 

It may have been used to replace a blown fuse. (Been there. Done that.) Enough current flowing through a bronze cent might cause some melting.

 

Ok thanks everyone. Looks like I ended up with someones science experiment.

 

Looks like a fire coin to me.. I agree with the others.