Can anyone say what it was that distinguished the SA K7 hub from other K series hubs? Also, over what period was it produced? I'm guessing this one I have is late 1930s/early 1940s as it's earlier than the Sturmey hubs with the dates stamped on them. It came off a Raleigh roadster that had a war-time look about it.
Thanks,
Bruce
Dundee
Scotland