1702 Dated Medal Used As Necklace

I was given 1 of these back in 1966 by my uncle who was an avid coin collector up until he passed away in 1971 at the age of 62. He was an avid coin collector. He had a fantastic coin and currency collection in his home. He kept his collection at his home in room approximately 20 x 12 with a vault door installed into a small adjoining room. My father would take us over to my uncles for Christmas in the late 1950's and 60's. My uncle would teach me about coins and currency. I remember seeing many rare coins and he would explain them to me. Every year he would give me a few of his seconds or thirds, keeping me interested in coins as I still am now. One year in the mid 60's he gave me a 1702-coin or other colonial trade use. He told me keep it, don't trade it or lose it. So here I am at 68 still holding on to this. It does look like it was turned into something to wear around ones neck. It is an alloy with 11 stars showing, it looks like it could possibly have had 12 stars around the outer rim.
There was never any cleaning done to this, I kept it sealed in saran wrap all these years until I re-found it last week. I wrapped it up in the late 60's. It looks like it could possibly have had 12 stars around the outer rim. It was exactly like this. The coin shown here looks like it had been in salt water for very long time. I was a former recreational scuba diver and have seen corroded The one I have is still in great shape considering the date, 3 pictures are included