Leonhard Hellmuth

 Designer

Ansbach. Bavaria.
Art teacher / Entwerfer-Künstler /  Designer Artist
Known dates: Born 1859. Died 1932. Actively designing around 1904.
Designed steins for: 
Eckhardt & Engler, Reinhold Merkelbach, Roßkopf & Gerz,
Steinzeug-Industrie
The steins he designed for Reinhold Merkelbach are all marked with a distinctive marking, 'LH' combined with a number. So LH1, LH2, et cetera. As per a catalog dating to 1905 the models are numbered LH1 through to LH40.
Reference: Stein Collectors International MySteinCollection