Hohner advertising brand "Sailor Music", made by the company "Jos. C. Huber, Diessen vor München". Miniature advertising for Hohner accordions. It shows soldiers during their leisure time with beer mug and German accordion model (stops above). Beer mug and tobacco pipe (with the person in the background) could not be missing here.
Graphically attractive: The banderole with the lettering "Accordeon".
Further information (in German) about the advertising stamps can be found on the page Marketing en miniature.