For sale is a rare 75mm in excellent condition. Arri Standard Mount. It doesn't say "Series II" on it, so I'm pretty sure it's a Series I. Serial Number starts with a 5. I also have a 32mm Series II CSP that I'm selling - I think I'll make a separate post for that.
I popped this on my Panasonic S1H and unsurprisingly, it covers Full Frame (two pictures attached). Typical of Cooke Speed Panchros of this vintage, it has some very light coating scratches in the front and rear elements, but nothing that would affect the image in any way. This is a very good candidate for rehousing at TLS.