Lunette is french for bezel and its gold plating is 20 microns thick. Fond is french for caseback and its gold plating is 40 microns thick.
Also I think that plaqué G (galvanique) is electrical plating, and plaqué L (laminé?) is rolled gold, thicker than electrically plated..
And the last piece of the puzzle, the stamp. CB in a domed box is the case maker, Centrale Boîtes (Central Watch Case Co, Biel, Switzerland).