1944 LWC Big Deep Obverse Lamination

CH, IMHO as deep as the void is, if it had been a planchet flaw with no metal in that area, the devices would not be there.(Neck, tie , throat for instance)
If it had been a struck through extra metal and that fell out the details could still be there as they get transferred pretty deep into the metal.

And Coops thoughts on acid from a dropper seems to fit also, except I think the profile of the 1 would have been affected.

EDIT: Just noticed a little "dip" in the outline below the tie (in the area where the void seems to disappear). It almost looks like there is a short "finger tip" of metal, extending south, that hasn't fallen out.

Very nice struck through coin !
Were this a lam there would be striations of the metal in the recess that are the hallmark of lams.
The overall circulated condition of the coin is somewhat disguising how soft the design details are in the recessed area that were caused from them being transferred through a foriegn object. Note how the fold of the jacket goes from sharp to soft as it enters the struck through area

It appears to be a struck-through error. The lack of striations in the depression, the lack of lamination cracks outside the depression, and the smoothly sloping margins of the depression are all consistent with a foreign object having been struck into the coin.

Oops! Not what I was expecting. Looks like I've still got some more to learn. ;) Nice find GC!

-CH27