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@Rik_Van_Looy
apolloxl - I'm pretty sure we do have frames from the same source.
I'm also near certain that they're not Gazelles.
The wrapover stays, campag. ends, pointy lugs and plate crown look to be pretty commonplace on high end italianate track bikes of the late 60's early 70's. The fact that it's just a 4-digit code rather than an alphanumeric 6-7-digits means we can rule out claud butler, holdsworth, raleigh, carlton et al and focus more on the lower volume manufacturers i.e. UK frame builders building trendy european style frames during that period. An intial thought I had was Bob Jackson.
On bikeforums there's an archive of Bob Jackson frame numbers, most of which are 5-digits, but there's a 1973 frame numbered 9359, so that's certainly not ruled out.
I then found this frame on the timetrialling forum, which looks to be bang-on except for the ground-off track ends!!! the wrapover stays are just right too, as are the forks...
If anyones got a similar era of Bob Jackson, any chance we could compare the serial number stamp????
Cheers