Thanks @David Holman! The etches are something else as you say.
This one is a real piece of history, as I think it might be a really early version……I looked back at your build and the etches are quite different, as these pictures show. Yours are brass but mine are NS. Not only that but the drawing out is very different- look where the rod etches are in each…..I also think the rods have changed slightly, as mine have the joint on the short portion.