Don't know if anyone answered you adoubletap? I was looking at dogsballs 'bash' bake at the weekend, it has a similar detail but with the lugs on the ehad tube and not on the top/down tubes. It's lugged, but then the lug's extension is filed off on one join to make them look fillet-brazed. I think!
But the more I'm looking at that the more I think it might somehow be both.
Its one bike lug hand carved by Watanabe san.