1999 Delaware Washington Quarter, first in the state series. I remember when we went out of our way to collect those when they first came out, pretty difficult to find these days in pocket change.
Good finds. Most of my rings have come from around basketball courts. Try mid-court and the corners. In my area those seem to be where the bags get set down 🤷🏻♂️
Just a thought ...
I collect coins - only the ones I've found while metal detecting.
Over the years I've always looked for dates of coins I needed for my collection.
This includes very old up to modern day coins that I've put in (28) different folders and albums.
Example ... my main interest is old coins but I have a State Quarter folder with (84) of the (100 - P&D) Quarters in it.
I found that the more time you spend handling coins - new or old - the more you learn.