Nice machine! Thank you for showing it. It looks like a little different bobbin winder than the German site I linked to. I'm wondering if it may be a little older than the one shown there. I know a lot of the early European machine has a bobbin winder with a long arm on them. Yours appears to be in between the really old styles and a more modern ones. I'm thinking that maybe they needed a different winder for electric machines.
Janey - Neat people never make the exciting discoveries I do.