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@Rik_Van_Looy
^^ The best thing you have to go on are the track ends - the seatstays meet the ends a long way back and the shape's pretty odd too - if you can get a match for those you're well on your way. - Flickr searches as well as Google image can be quite useful for finding a match
I have an early 60's Bob Jackson track frame - no. 4339 (1964) - it has standard campagnolo track ends (same lugs though - prugnat I think) so the date's probably fairly accurate.
The serial# format can also help to eliminate possibilities (the mass producers tended to have alphanumeric or relatively long serial#'s) and some builders had month/year type serials, it's also worth checking kilgariff's pages to quickly see if it's a holdsworth or claud butler.