It's not worth anything. Mail it to me and I will handle scrapping it for you. I'll be the big person here and save you the time and money of going to the scrap yard yourself and risking a flat tire.
All honesty, I don't know the value. But it sure looks neat!
Did you get any collets with it except the one pictured? I think that's more pertinent than what it's worth, as the question of how available those collets are would probably determine a large part of it's value. Unless you can find someone with a bucket or two of those collets and they are missing the closer....Food for thought.