Air-cooled single cylinder Type ST (STL 400U)
Water-cooled single cylinder Type ST (STW 400U)
Water-cooled twin cylinder Type S (SZW 800)
Water-cooled four cylinder Type R (RVW1200)
More about the very rare Type R - https://dkwautounionproject.blogspot.com/2025/06/1931-dkw-r1000-stationary-engine.html
