Ch. Weiss advertising brand "Fluta", manufacturer unknown.
The family idyll advertises a special harmonica product by Ch. Weiss: The "Fluta" was a kind of predecessor to the 1958 Hohner melodica. Around 1910/20 the so-called Blasharmonikas of similar kind were also produced by some other manufacturers. The rhymed slogan was not missing at Weiss.
Further information (in German) about the advertising stamps can be found on the page Marketing en miniature.