Max Künzli-Tobler (born Max Joseph Künzli, 1890–1966 ) is covered in the
German Wikipedia article on his father.
He used the logo MKZ. He is best known for his postcards of humanised cats, the drawings were made by the Zurich artist Eugen Hartung (1897-1973). These were also published in the USA by Alfred Mainzer Inc. Many are illustrated
here.
The series is mainly postwar but started in the late 1930s.
