Cool watch. Is it yours? Post it here: https://omegaforums.net/threads/obscure-and-vintage-dive-watches.20373/ The company Montres Breil SA apparently existed for a while in the mid-1980s, and was liquidated in the late 1990s. I'm not sure if the Manta was a part of their product line. Last known address listed their offices in the Breil-Brigels region of Switzerland.