Ultra rare lens by Taylor Hobson. I can't find any information on this version of the lens. I have found some versions without the focus ring but they look nothing like this version.
This version has a focus ring which moves smoothly and has a strange m39 mount plus within the mount there a C mount screw thread.
What this can be mounted on to actually use i'm unsure of.
The glass look ok but its hard to see the optics inside.
This is be sold as is with no returns.