cant speak on the corum, but the cartier isnt legit. first thing i noticed is the rubber strap.... the sides arent clean cut at all.... I had a santos 100 and the straps are quite nice. The hands and subdials are wrong, as is the font on cartier. ON the caseback, the engraving looks a smidge too shallow. That being said, i dont know much about corum, but id assume it was fake based on the cartier.