Hi Helen, I see it's been a long time since your post, and maybe you know more about your machine by now...
I've just come across a machine so similar that I'm sure it must be the same thing...except mine is named "Robertson" and in a treadle cabinet.
Otherwise, it appears identical...except a bit scruffier.
I am particularly interested in the stitch length device, which on mine doesn't seem to be working, and also in whether it will reverse...given the stitch length number layout rather hints at this possibility.