1944 penny..Acid, dremel or possible lamination issue?

I just finally got my actual scale out to accurately weight the split planchette and it’s lighter then I thought

 

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I have no idea why my photos won’t show the display. But it’s 1.67 grams

 

It’s the angle of the light hitting the screen of the scale. Try different angles.

 

Cool split planchet error.

It may have split when someone touched it to the grinder.
The obverse seems to indicate PMD because of the pushed up metal on the edge of the cut.
The obverse color is a nice even, worn brown, the inside is a brighter color and the fine wire rim that is left on the reverse would show damage or circulation real easy.
This may indicate it circulated for a while before it split.