Chronographe Suisse is as far as i am aware a generic term for an effectively unbranded chronograph produced in Switzerland. this was during the 40's and 50's and they often contained landeron or similar movements. i've owned a couple over the years in gold and steel cases. good quality movements, but who they were assembled by is anyones guess.
this i hasten to add, is only an impression i have picked up over the years as i too could find no information on 'the brand'. i could however be completely wrong and they may have been a proper company.
hope this helps
Graham