Ernst Hess was an instrument maker established in 1872 in Klingenthal, Germany. After Ernst died his family carried on the business (adding Nach. to the business name -  Nachkommenschaft meaning descendants). Ernst Hess was best known for accordions and brass instruments but also sold stringed instruments including guitars and ukuleles. By the 1930s the company was simply known as Hess Musik.
 

Source: Lardy's Uke database