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.
I have left the original patina. The item "VINTAGE NAVAJO INDIAN SILVER & THREE GREEN TURQUOISE THUNDERBIRD CUFF BRACELET" is in sale since Monday, October 23, 2017. 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.