[old.wrench]

Stop-a Chopper hub, as Ryan says. You are missing a few pieces. You can find the hubs, but I think it would be pretty hard to find replacement parts. It's probably not worth much as it is.

Well, I'll be doggone!!
I guess I missed this thread first time around. Just so happens that I've got the elusive parts in my stash. Me and the hub parted company long ago, but I still have both levers and the hollow hex shaft as shown in the bottom pic.