From the Tamworth Swine Association:

"The Tamworth is an English breed of hog that was of distinctly bacon-type. The first Tamworths were brought to the United States in 1882 by Thomas Bennett of Rossville, Illinois. The Tamworth was slower in becoming as popular with the American hog producer as the thicker breeds, although there have been some strong advocates of the breed. Tamworth are very
deep-sided hogs and are uniform in their depth of side. They have a muscular top and long rump. The ham is muscular with a firm lean rump. Trim jowl, trim underline and depth of side"