According to the website of the V&A museum: "Herman Robert Bichweiler, a designer and architect, established 'Die Kunstgewerbliche Werkstätt' in partnership with Dr. E. Berlieu in 1878 in Hamburg. Carl Paul Börner (1828-1905), an architect, was employed as one of the principal artists. They specialised in a form of maiolica using transparent glazes on deeply modelled forms. Within a few years the company was awarded prizes at Melbourne (1880) Frankfurt (1881) and Hamburg (1889) for its ceramics and also began manufacturing glass, metal and leather wares."
At least in some period of time they sold their products from a sales-room ("Verkaufslokal Kraas & Co") in Hamburg, Adolphsplatz 7.
Beer stein by R. Bichweiler
Marking on the base of the featured stein
Marking on the back of a decorative tile
Another marking. This one mentioning "Kunstgewerbliche Werkstätt"