My new addition

I recently picked this up on a visit the the coin shop. I'm not sure if it's struck through grease, a capped die, or whatever. Any input to share and steer me in the right direction here? I think the year is 1974 but it's pretty tough to tell because the obverse is so mushy.

 

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Damaged by extreme heat…or partially immersed in an acidic solution…or both.

 

So I'm still learning here about different error types, but what indicates high temperature about this? Wouldn't both sides have been heated similarly seeing that copper is an excellent conductor? As for the acid, I'm not seeing any pitting but maybe that's not something to look for?

 

Weight is spot on, btw.

 

Where is @paddyman98 when you need him?

 

I'm not super familiar with strike throughs, but this looks like a struck through die cap error to me. If it was damaged by heat that badly, I would also expect the reverse to have at least some damage.

 

I think the OP's coin is a Struck Though Debris, due to some of the design still being intact. Most capped die strikes will distort the coin struck evenly across the face.
IMO.

 

I am in the "struck thru late stage die cap" camp. You can see the slight outline of the memorial. Mushy details and a fully detailed reverse.

 

Struck through partial capped die. Part of LIBERTY was struck good.
Definitely a mint error.
Neat. Thanks for sharing.

 

I have personally seen this smushed, melty look produced by heat, and personally own the dime where both clad layers were dissolved by acid immersion resulting in surfaces like this one. The ripples in the surface also suggest heat damage such as maybe a house or car fire. So, to answer @No_Ragrets question, these are what led me to suspect heat or acid. Thank you guys for likes and support.

BUT…I am no expert in error coins. @paddyman98 is, and I enormously respect his skill and experience in the error coin genre, as well as @Pickin and Grinin . Not being an expert in capped dies, and reviewing the coin once again, I agree with Ed…the part that sold me was the “good” part of the coin. That part led to my supposition of partially immersed or partially heat damaged. I continue to learn from Coin Talk, just like other members…Best Regards, …Spark