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.
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?
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.
