Looks to me like a Barra aluminium frame - especially because those brakes look like Barra cantilievers from the photo (or is that Faliero Masi smiling??). My guess also is second cable is for the rear deraillieur.
There were other frames that looked similar of the period (Mercadier), but the brakes seem to be a hint. And Barra was by far the most prolific of the French aluminum builders.
Barra high-end frames often had shaped tubes and other features, but with a custom cross frame anything would go. If someone gets better images, myself or Jan Heine could provide more feedback.
During this period I know that some pro riders did use Bara frames - and not always with the best results I believe. But they are rather cool.
Mike "at my 3 message limit" Kone in Boulder CO
>
\r?\n> Aldo shared with us:
\r?\n> > Pic of the Day
\r?\n> > 11 August 2006
\r?\n> >
\r?\n> > Cyclocross 1950
\r?\n> >
\r?\n> > http://www.wooljersey.com/
\r?\n>
\r?\n> Cool photo (thanks Aldo), cool bike.
\r?\n>
\r?\n> I don't have a lot to base this on, but could that be an aluminum frame?
\r?\n>
\r?\n>
\r?\n> Definitely bar-end shifters, at least on the left - you can see the
\r?\n> housing exiting from under the tape near the stem. Left side would
\r?\n> normally be for a front derailleur, so probably two chainrings? I do
\r?\n> think I see a front derailleur cage as well. If I squint just right I
\r?\n> imagine I see a Huret front derailleur, of the helical-activated type.
\r?\n> And you know, that could just as well be a Huret (Louison Bobet type)
\r?\n> rear mech right? Or do you see definitive Simplex attributes? (Robic
\r?\n> did use Simplex in the '47 TdF though.)
\r?\n>
\r?\n> Maybe two handlebar pinch bolts side by side on the stem, underneath the
\r?\n> bar? If so that might help ID the builder, it's somewhat rare. Herse
\r?\n> did 'em that way, and a very few others. Herse pinch bolts are
\r?\n> vertical, in front of the bar though (and of course his stems were
\r?\n> shaped quite different from this one).
\r?\n>
\r?\n> Paging Jan Heine, we need you on this.
\r?\n>
\r?\n> Mark Bulgier
\r?\n> Seattle WA USA