If it is a Bertin, I have touched the big deal, as the only model in Reynolds 531P is the Bertin C79 SSC. http://bertinclassiccycles.com/bicycle-models/
But it still remind me the work of Alain Michel, same raccord, pattes, a tubeset in the catalogue of the cadreur, the emaillage and the fact that the bike come from a parisian bouclard and not the great white north. (absence of Michou's gravure isn't a big point as my former one neither got one)
Galerie de mon quai de gare.
https://lh5.googleusercontent.com/-4Ru4z_laVBw/UqDsC41_ozI/AAAAAAAAAK4/_7fIIdLHIsQ/w667-h376-no/2013+-+1
If it is a Bertin, I have touched the big deal, as the only model in Reynolds 531P is the Bertin C79 SSC.
http://bertinclassiccycles.com/bicycle-models/
But it still remind me the work of Alain Michel, same raccord, pattes, a tubeset in the catalogue of the cadreur, the emaillage and the fact that the bike come from a parisian bouclard and not the great white north. (absence of Michou's gravure isn't a big point as my former one neither got one)
Now, the only interesting information I wanted to share (yes I know, it was a big long to come to this point)
If you believe the internet, 531P tubes are a mix of Reynolds 753 and 531.
http://search.bikelist.org/getmsg.asp?Filename=classicrendezvous.11001.1289.eml
Another tubeset to look after.