From my personal collection of many years, here is a Kenko CF1 Auto Plus 2X tele converter lens (effectively doubles your lense's focal length) for Canon FD lenses.  Condition is in excellent used and fully functional condition.  I bought it new years ago to use with my Canon F1 cameras.  Please check pictures carefully for condition as they are part of this description.  What you see is what you will get, if it is not in the pictures, it is not included!  

I have been an Ebay seller now for more than 25 years so please check my feedback and bid with confidence. If you have questions, please ask them BEFORE you bid!

Thanks for looking!