LOMO OKS4-75-1 lens 2.8/75mm, T/2.9 in Konvas/Kinor OCT-19 mount, #651069
This high-quality lens was made in 1965(#651069) at famous LOMO factory.
The lens is 7-elements anastigmat. It is purposed for 70mm film movie cameras with 23x52.5 mm frame size. This gives 57.3 mm image circle that is enough to cover full 24x36 mm frame (43.3 mm image circle) and even some medium format cameras like Hasselblad H5D-50C. Will cover 6K and 8K sensors easily.
The lens has OCT-19 mount, but can be used with other cameras if you have corresponding adapter.
The lens has special housing purposed for coupling with front anamorphic attachment.
Glass has many cleaning marks and some fungus.