It is Sandcast and of at least 90 percent silver purity and I believe it to be coin silver. There is patina on it due to age. On the backside of the naja there seems to be some kind of engraving that looks like a "tb" and another symbol next to it. I cannot decipher it at all.
I believe this naja to be pretty old based on the design and condition of it. The older naja pendants were made without any turquoise. Measures about 2.75 inches by about 3/8ths. Weighs a solid 44.1 grams. This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Necklaces & Pendants".The seller is "silvergoldjewelryshop" and is located in this country: US. This item can be shipped to United States.