A+ rating with the BBB. Veteran Owned. Family Owned. The Coin Exchange of West Covina is your source for Coins, Gold and Silver in the San Gabriel Valley. Serving Los Angeles county since 1963. We specializes in rare coins, bullion, coin collecting supplies and more. Proof sets, mint sets, Silver American Eagles, Gold American Eagles. We are an official licensed carrier of U.S. Mint products. We accept coins for professional grading with NGC and bank notes for submission to PMG.