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

other forums have stated previously the Millennium 531 can be tig welded as the tubes have a thicker section at the end and are slightly heavier. The downtube does however look like aero profile as used by 853 Raleigh, Donhou, Weigh and others inc a Sirius micro track bike i own.
 
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