Thank you Jury Duty - Found A Ring

[Lefty]

I had jury duty today and they released us around noon so I headed back to the park that I found a ring last week. After about 30 minutes I found another ring in the same general area, see photos below. It's a leaf ring, not sure what it's made of, it rang up in the silver range. It says something inside but I will need to clean it up to make it out. This is an area that has lots of trash but old trash, many old style pull tabs. Also, I dug up a mason jar that is still sealed, with what I don't know. I'm afraid to open it.
Thank you Jury Duty.
Lefty

 

[cti4sw]

The age of the park has no bearing on the ages of the jars. What was there before they were parks?