Cooke S4 (/i) 25mm Front Glass Replacement: Which way does the glass go in the lens?
This information is for qualified technicians only; do not attempt the replacement if you do not have experience in handling the glass properly.
For the Cooke S4 (/i) 25mm, the front glass part number is 99-1476. It has a shallow convex curve facing to the outside and a steeper convex curve toward the film plane.