The 99-D and the 86-D looks like it is a Struck Through Grease error. But this area is often affected with this on the Memorial cents. Note on the devices how they look wide in those areas? That is because the only area being struck up was the lower edges of these devices. The tops are block with grease in the die. (they are tapered on the die for easier release after the strike.
Nice. Thank you. So are Struck Through Grease and filled die errors the same thing? Also the 'L' looks as if the die was filled with grease just like the 'T' in 'TRUST' on my quarters.
The technical term is "struck through error" (grease). Other may call it a filled die, or just a grease error. But I like to use the correct terminology.
The "L" on LIBERTY looks like die polishing reducing the field so much the L is going away. If it were a struck through error (grease) then the "L" would be missing or a lot wider like the coins you posted above.
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