This came specced with full M730 XT and a set of Michelin amberwalls each of which was close on a kilo. I put it on a bit of a diet before clobbering it up with practical parts. Haven't had the heart to weigh it, as is, but the frame was a bit over 5lb if I recall correctly.
For the record, here's a pic of the inexternal brazing profile. From what I've gleaned, this can be either a fast pass hit or miss process using a factory jig and lots of heat, or a damn-tricky-done-by-hand-with-lots-of-skill-process.
Headtube gussets were fitted to some of the lower end factory bikes to mitigate inexpert inexternal joint failure. Given the cut-lugged seatsaty bridge, I'm hoping mine was constructed in the tradition of the sweet Motebecane builders of yesteryear.
(pic from Ian Raleigh's excellent La Redoute road bike) :Here
Here's a pic of a Tracker with cool paint. I think this is a bit earlier (1988?) with a horizontal tt, but some of the French guys might be able to say for sure..
, on Flickr