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@MrE
I think it's a Hirondelle design? (Waits for anyone who knows better to pitch in)
I'm pretty sure I've read about someone on here building one: here’s the link now I know to use "retro direct" as the search term
http://www.lfgss.com/thread98676.html#post3348646
http://www.frankb.us/gears/ has a bit more.