This is sterling or a slightly lower grade of silver. The bar itself appears to be chrome.
As seen in the lower photo, it has remnants of some white paint or something on the back. The item "VINTAGE 1940'S NAVAJO INDIAN SILVER & TURQUOISE DANGLE TIE CLIP" is in sale since Wednesday, August 22, 2012. 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.