35mm LOMO optical block f/2, #750174
For sale is inner optical block of 35mm lens OKS8-35-1 made in 1975. You may use it as replacement block if your lens is damaged.
Also, you can use this thing as a small standalone 35mm lens if you find a way to mount and focus it.
The block is small - 32mm diameter, 28mm length.
Excellent optical and mechanical condition, though there is some oil on the aperture blades.