opinions wanted on this 197? Lincoln--cap die, grease, dryer coin?

[port ewen ace]

center of reverse is a sunken area, rim is smooth & normal, appears to be a '71-D

 

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[enamel7]

I think it's post mint damage. Exactly how it happened is anybody's guess!

 

[kcm]

Sadly, I have to agree. Interesting to say the least!

 

[mountainman 2]

I'm leaning toward a grease filled die on that one. I have a similar one with the missing detail on the memorial building and that's what I was told I had.