Like most older Native American jewelry, this piece is not stamped or hallmarked for silver content. It is sterling or a slightly lower grade of silver. The item "VINTAGE 1940'S NAVAJO INDIAN SILVER TURQUOISE EYE BURRO DONKEY PIN BROOCH" is in sale since Wednesday, November 28, 2018. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Vintage Ethnic/Regional/Tribal\Native American (pre-1935)".The seller is "deja--voodoo" and is located in Santa Cruz, California. This item can be shipped worldwide.