Bavarian-born Levi Strauss moves to Gold Rush era San Francisco to open a dry goods business. He sold clothes, boots and other goods to the small retail stores of the American West. Jacob Davis, a tailor from Reno, Nevada, teams with Levi Strauss to create riveted-for-strength workwear made of true blue denim. On May 20, 1873 the U.S. Patent and Trademark Office grants patent #139,121 to Levi Strauss & Co. and Jacob Davis for their invention. This is how the blue jean, originally called "XX," was born. The Two Horse logo demonstrates the incredible strength of Levi's clothing. The logo is first branded onto the leather patch of the "XX" jeans in 1886 and is still used today.