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Nice one, cheers Rik. It is BSA threaded. I reckon Roberts might be a good lead. I called them today and their numbering system was three digits up until about 1984. It's got the same fork crown of another Roberts track frame I found, and the curve of the fork looks similar. Chas isn't back in the shop until Wednesday though so I'll have to wait for confirmation...
dbr
@dbr - nice looking frame mate.
Assuming it has BSA BB thread (i.e. not italian) we'll assume it's a UK frame builder
perforated lugs are not hugely common here - typically on TT bikes back in the 70's.
Intial thoughts: Ron Cooper, Chas Roberts, Dave Russell and those sorts of people would be a good place to start. My Roberts also has perforated lugs and frame number is 107 (early 1970's)
http://www.pedalroom.com/bike/chas-roberts-tt-rat-early-70s-19278