A 75mm LOMO lenses are one of the best choice due to great image quality and relatively low price.
They are purposed for 35mm film movie cameras, but have larger image size, and can cover even a full frame sensor.
This lens was originally made for a Gladiolus camera, most probably (based on its body design and color), but the previous owner modified it to the Canon EF mount, and added a front adapter to install standard 67mm screw-in filters.
The lens works well, though the focusing mechanism is a bit stiff, and has more than usual breathe (about 2mm of the distance scale).
There are some dust particles, and many cleaning marks, but none of these will affect the image quality noticeable.