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

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

ANACS 1990 silver eagle struck through reverse. The coin shows a large struck through area in the central area of the reverse. MS65

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...

PCGS 1992 silver eagle with a large struck through plastic obverse. Larger than normal, and extending from Ms.Liberty's head to her foot.   MS66

NGC 2018 silver eagle with a large struck through reverse in the 2-3 o'clock area.   MS69

PCGS 2014 silver eagle with a high finned rim on the reverse from 5:30-10:30 o'clock. A very high finned rim on the reverse, and scarce this dramatic.   MS68

NGC 3 Piece 1996 Silver Eagle Progression set of Struck Through SIlver Eagles MS68, and MS69, and MS69.   The 1st coin has the piece of plastic string or wire-like  substance retained at...