MC (or CM) (name unknown)
Address: ?
Künstler / Artist
Known dates: 1903 - 1908.
Decorated exclusively for Villeroy & Boch - Mettlach "Brick Base Series" #2833 A, B, C, D, E & F, in sizes 0.3 & 0.5 litres, also #2888 in sizes 0.5 & 1.0 litres.
Each of the "Brick base Series" #2833 steins have the title of a popular song of the times, in the design:
#2833A: Am Brunnen vor dem T(h)ore. #2833B: In einem kühlen Grunde. #2833C: Loreley.
#2833D: Keinen Tropfen im Becher mehr. #2833E: Ich hatt' einen Kameraden. #2833F: Gaudeamus igitur.
Finally #2888: Sorglos wie's Gewölk am Himmel.
Reference:
Lid detail on Villeroy & Boch - Mettlach #2833B stein.
Artist's signature on Villeroy & Boch - Mettlach #2833B stein.
Base detail on Villeroy & Boch - Mettlach #2833B stein 
Villeroy & Boch - Mettlach #2833B stein,dated 1903. 
Signature on a Villeroy & Boch - Mettlach #2833E stein, dated 1903.
Signature on a Villeroy & Boch - Mettlach #2888 stein (with no brickbase), dated 1908. 