Vintage Sterling Silver Coral Ring Size 7

This is hands down the most unusual ring I have come across the inside is marked Sterling and there is a symbol. A shield I'm really not sure. I can't make it out someone put some time in this ring. It has a liquid coral panel across the front of it. It's just beautiful The ring is a size 7. It could use a good cleaning, but I'll leave that to the new owner all sales are final so please ask questions if you have them the ring is in excellent pre-owned condition. T-2021