This is an OMAS lightweight "Big Sliding Diamante" on - first I ever saw - unfortunatel cleaning showed that the lower cup has a very light split - so Stronglight A9 will probably play the role :?
I noticed this thread while looking for info on Alain Michel .. I see you have two ?
Your chrome one is a cracker and looks to be same tubing as mine ..
I was wondering if you have full cable outer through top tube ? I can't get full outer through mine they are like cable stops inside and inner binds slightly inside top tube .. I remedied this with using length of plastic sleeve(removed from gear cable outer) works a treat smooth braking