PCGS 1998 silver eagle struck through plastic obverse. The coin shows a large struck through at K-8.   MS66

Small, retained struck through obverse at 8 o'clock. The struck through appears to be a piece of glue or hard black matter. 

PCGS 1990 Silver eagle struck thru numerous retained wires on the obverse. There are many small, thin wire fragments scattered across the coin's obverse, and especially in the 11 o'clock area...

Struck thru plastic obverse, with the long, triangle shaped strike thru at 3-5 o'clock. 

PCGS 2022 silver eagle struck through retained plastic obverse. The plastic is a white/brown color, and is at the 5 o'clock postion on the obverse.   MS69  

PCGS 2016 silver American eagle struck thru retained plastic obverse. The plastic threads are retained throughout portions of the struck thru area.   What the threads came from in the Mint is...

NGC 1998 silver eagle struck through obverse and retained debris. The debris appears to be hardened grease or a dark glue-like substance.    MS69

NGC 2015 silver eagle with a retained struck through obverse, which is an orange/yellow color.    MS69