Vintage Coeur D’ Alene Idaho State Travel Shield Charm. Beautiful detail!

Vintage Coeur D’ Alene Idaho State Travel Shield Charm. Beautiful detail on the charm with the sailboat & background land and water. In my research of this they all say sterling silver, however , this has no markings that I can see. So I am not a 100% of what it is made of. Measurements in the ad. USED - No visible damage Thank you for looking ! Charm USA Vintage Idaho Coure D’alene Sailboat Nautical