Lugged Lambert

Lambert did indeed market a lugged frame - the early ones (1972) were like this. They have rather elegant semi-wrap-around seat stays. No-one seems to know who actually made the frames. Since the filet brazed Lambert and Viscount Aerospace frames were made for them by Trusty it is assumed that the early lugged frames were made by someone else.

My gold Lambert has this sort of frame and there are also some nice pictures on the ClassicRendezvous Lambert page.

Others know more about this than I do, but Viscount certainly made a frame with lugs on the head tube but not elsewhere. I think this was generally called the 'International' model. Possibly Lambert also did this. Any sign of a model name on the bike? However, the lugs are not the most attractive I've seen and perhaps, as you suggest, this was a repair.  This could explain the rather icky paint around the head tube and the replacement forks (perhaps the Death Forks failed??).  Also a Tange headset, which wasn't original.  However, the front wheel looks fine and original, whereas the rear is probably a replacement (Suzue) and is a bit wonky(?)

For reference, a couple of pictures of the lugged head tube on my Viscount A/S Victor, which has a fillet-brazed rear triangle:
(With apologies to Bendo for showing these!)
Headset by RMT@261, on Flickr
Untitled by RMT@261, on Flickr

There looks be a bit more scalloping on these than on the lugs on Vinniecircles' Lambert.