That was an early stem, hence the rather messy brazing. It was just the only quill stem I had to throw the frameset together to check it rode straight!
I think I still have some of the quill tube stock, not sure what I have to make the extension tube out of.
That stem! That stem is brilliant. I’ve been meaning to ask you about stem commissions after I saw this https://www.instagram.com/p/CPiopCAhCa6/