Bob,
Veteran Douglas models used hubs purchased from Chater Lea. I have seen several dates mentioned here on the forum as to when they changed over to manufacture of their own hubs; from 1912 to 1914. Someone might be willing to put a more definite date on it, but it might be another one of those Kingswood examples of where they used up older pattern stock on the cheaper 2-3/4hp models. A second topic would be whether Douglas hubs from c1914 had their name engraved, or if that came later on.
-Doug