Tig-welded Graham Weigh frame, possibly late 90's/early 2000's. 55cm.

631 725 853 and 953 also as far as I know. Don't know if 531 can be tig welded.
Have been looking on de tinternet.

Looks like you can't TIG weld 531 tubing.

531 however could be bronze welded/fillet brazed to reduce the heat affected zone. it was used on high spec racing bikes (including Jack Taylor's and Claud Butler's BITD).
 
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