Cooke 9-50mm T2.5 Zoom lens. Recently remounted to PL at Duclos Lenses. Rear element is very clean. Front element has significant coating wear but no scratches or pits in glass. Duclos noted that Focus and Zoom are dry. Everything moves smoothly, no bumps or tight spots. Just completed a 16mm film with this lens and it performed very well. It is a very sharp lens. Focus scale is metric.