It's like a 300/450/600, and they are selling it with the shutter optional, so that if you have another lens with a recent Copal #3 shutter, you can screw the cells right into it, and there is a slip-on aperture scale. The cells should fit any Copal 3 since the 1950s, but the aperture scale will only fit newer ones. Estimated price posted on f32 list is 1250 UKPounds without shutter.