Thanks Alan
Rooting about for 'classic' old tools in a sales section at a recycling centre (read rubbish tip) and saw this sitting in an old mug half full of rainwater. Prices at this place are incredibly cheap as they just fish things out of the rubbish and will take pretty much whatever you offer for them within reason. This along with 3 engineers files, a gas torch /long handled burner, a pair of pliers and a bit and brace drill cost me £3.
I'd not heard of the lens before but did recognise the Cooke name so I picked it up as a curio. It seems I got quite the bargain despite its rather poor state, it is a 35mm cine lens - fortunately no water got beyond the helicoid, into the aperture or behind the lenses.
More here
