Severin Films is a notorious DVD and Blu-Ray distribution company based in the US (with the occasional UK release) that releases all sorts of sleazy, perverted and controversial films, with an edge of curious fun of course. Whilst not having a range as great as a company such as Arrow or 88 Films, Severin holds the US distribution rights to many cool movies, from direct-to-video zombie flicks to Jesus Franco sexploitation pictures! Anyway, here's your list. I won't keep you waiting too long.
NOT ON LETTERBOXD:
The Sinful Dwarf (1973)
Dracula's Castle (1969) (Extended TV Version)
Creation is Violent (2020)
Horror!!! (1964 Documentary Short)
Behind the Mask (1991 Documentary Short)