Hi i have just bought this track frame ... and i am not sure what brand it is and would really like to know more about it. The bottom Bracket shell has a V cut out of it and the serial number is CO 0343
Does anyone have an idea of what it is ? Thanks

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By any chance, does that thing have English BB threading?

Those head lugs remind me of this (though they are obviously quite different at close inspection):



The only other frames in addition to yours (and that faux Rossin above) that I've seen with those cutouts were in this thread - a Danish Schroeder, and that black Moon frame that Unworthy1 posted:

https://www.bikeforums.net/classic-vintage/545394-paletti-schroder.html

I forgot who brought it up, but one fellow did point out the pitfall of trying to ID via a circular hole drilled in a lug: It's the easiest lug modification any two-bit framebuilder can do - stick a lug under a drill press and go to town.

-Kurt

Thanks for the help is the bottom bracket shall V a common thing to have ?