This MOSAIC FIRE OPAL AND STERLING SILVER LINK BOX BRACELET HAS A MAKER'S MARK WHICH I CANNOT FIGURE OUT.  I believe it is Native American but I am not 100% sure.  The jeweler said it was Mosaic Fire Opal.  The color is gorgeous and it is sterling silver as I tested it to be.  This is 7 1/2" in length.  I do not polish vintage jewelry as I let the buyer do that if they desire.  If you want more pics just let me know.  This weighs 14.88 grams on my scale.