Washington State Quarter Reverse Issue/Error ?

They are small die chips caused when parts of the die break off. These are very common inside of letters and numbers, and I have seen them on just about every type of coin. Unfortunately, they aren't worth anything more than a curiosity. Some people collect them, but I usually throw them back, unless there are multiple on a coin, or it just appeals to me for some reason. I have 4 or 5 Jefferson nickels that show a die chip progession in the last O of Monticello. It starts out small, gets bigger, then almost fills the entire letter. They all came out of the same roll, so I'm pretty sure it's the same die. If I get I chance sometime, I'm going to photograph & post them.

Dave

One thing to note is that it is not "extra metal". When a die is chipped, the planchet will expand into those voids when a coin is struck and form a raised lump. Nothing is added and it has the same amount of metal as any other quarter.