I found these at a sale a while back and even though I needed them like a new hole in the you know what, I couldn't pass them up for what the owner asked for them. I would have thought they'd be more common but cant find anything much at all about them. Do you suppose Lumen is someones house brand? I did find that Elora makes the exact same wrenches in W. Germany. With the no. 110 on them also, but I can't find anything on Lumen. Also the Hazet sockets seem to show up more but again being W. German tools its not going to be easy to make any sort of set out of them, so if they fit someones collection, let me know.