1945 S Lincoln

What Caused this? I can see the 1 and 9 in the hollowed out portion.

 

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hard to tell, could be a struck thru.

or PMD

 

Also a Lamination.. that part of the Planchet fell off after the striking of the Cent.
I recently posted my first ever Error Coin that I found 30 years ago which I had certified by NGC it's not on the date like yours but same issue going on - here it is -

 

I am pretty sure that is a lamination.

 

Thanks, it has been puzzling me for about a week now.

 

It's more likely a workman hit it with side cutter. The gauge is too round for a lamination. This was strictly an outside error.