Manufactured by Gustav Kroboth, whose history in the automotive sector dates back to the 1920s. After WWII he moved from Czechoslovakia to Bavaria where he salvaged military and aviation relics to build a variety of devices. His Allwetterroller was a three-wheeled microcar which was introduced at a 1954 motorcycle show. Powered by Sachs 175cc engines (optionally JLO 197cc), some 55 were produced before the factory closed in 1955. He also built a scooter, described on other pages (see menu).
There are some delightful photos of the machine here: https://auta5p.eu/katalog/kroboth_d/kroboth.php