THIS IS A VERY RARE UNIQUE PIECE,I LOOKS HAND MADE, I AM THINKING IT IS FROM INDIA OR WESTERN OR CENTRAL ASIA, SOME WHERE IN THE MIDDLE EAST. IT WAS GIVEN TO ME  OVER 40 YRS AGO  . I MIGHT HAVE WORN IT 2 TIME SO I AM GOING TO PART WITH IT SO SOMEONE ELSE CAN ENJOY IT.  I THINK THIS MIGHT BE YEMEN NICKEL SILVER, IT IS NOT MARKED ,IT IS SO OLD IT HAS A GREAT PATINA ON IT I HAVE NEVER CLEANED IT,  BUT I DID THE MAGNET TEST AND IT DID NOT STICK TO THIS HUGE MAGNET I HAVE, SO I KNOW IT'S SILVER IN IT  BUT NOT SURE IF IT IS STERLING.