I have a Buck Supreme Versatapper model 6100 for sale.
I bought it used several years ago to keep as a back up to my Tapmatic that I use on a regular basis. So, I've never used the Versatapper much.
It seems to tap holes fine, but it is considerably slower than my Tapmatic head. It appears to be in good condition. I removed the top and partially disassembled to check things out before I sell it. It appears to be in good condition inside as well. None of the gears appear to have noticeable wear or damage. It changes between forward and reverse fine when I run it in my drill press.
It has a 1/2" straight shank with three flats on it.
It comes with two rubber flex collets, the wrenches, and the steel case.
$100 shipped in the lower 48, or make a reasonable offer.