LOMO OKS4-40-1 lens 3/40mm, T/2.5, Arri PL mount, #780026
This high-quality lens was made in 1978 (#780026) at famous LOMO factory.
The lens is 8-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 self-made Arri PL mount and not very convenient focusing. You may consider remounting it if necessary.
Aperture control ring isn't native as well.
Glass has many cleaning marks, but they shouldn't affect image quality noticeably.
The lens is quite rare, and I have only one such lens. So, no rush to sell it, and that is why the price is high.