You've got a cracker of a hub there! It sounds like a Blumfield Duralite which was made, I think, in the 1940s and 1950s.
The flange should be three inches in diameter if it's a Duralite. The nipple is the Tecalemit type.
The Duralite is similar in appearance to Harden Lightweights although the flange is 1/4 inch less in diameter. Bob Reid, if I remember correctly, has Duralite hubs on his Flying Scot (please chime in with your Flying Scot website URL, Bob) but I don't think they're large flange models.
Duralites were about the same price as Airlite Continentals-without the peeling chrome problem! By comparison, Chater Lea large flange lightweights, amongst the dearest in their day, were only about 20% more expensive. Personally, I prefer the Duralite.
Blumfield were a Birmingham company famous for the quality of their alloys and stainless steel. They also made photographic enlargers and they were every bit as high in quality as the bike hubs.
If you can find another Duralite to make a pair, you'll have a great pair of wheels! With a bit of elbow grease, the alloy hub should polish up beautifully and look a treat. There was certainly nothing produced at the time that was appreciably better than a Duralite and even now you'd be hard-pushed to better it.
Get your free email with GroupWeb Worldmailer at http://www.worldmailer.com. Send and receive e-mail from any computer with a web browser.