631 can't be right with cantis. It doesn't match any catalogue from 93 through to 99. I actually have a 96 one, fillet blobbed would be a better description rather than fillet brazed. There were 631 versions later in the 2000's but they had the larger downtubes as per the Sardar etcStickers say 631, fillet brazed.
We sold a couple in 96, 853 fillet brazed
I think it's 93,94?
That's Ahead stem and 653
That's Ahead stem and 653