This is your teacher talking .. Lol .. Young man, are you on your phone again, your disrupting the class, I'll have to take your phone, and you can get it back, at the end of class, say what ... lol ....
Every time I see the term washer or dryer coin I think of something I saw once. This is a 1988 $1 Canadian Loon Dollar.. that was Struck Through with a WASHER! Certified by NGC