Carl Künzli-Tobler, originally Carl Künzli, was a nephew of the brothers Künzli (Anton and Joseph) and set up his own business in Zurich in 1889, initially as a stationer. He published cards successively through businesses with slightly different names There is an article about him in the German Wikipedia, which also covers his son Max, who has a seperate entry here under the logo MKZ.
Th C.K.Z. card is in a form for the French market with a publisher S.M.P. which I have no information on.
