Hamilton Watch American Classic Jazzmaster Regulateur H42615553. The Hamilton Jazzmaster Regulator teasingly liberates the minutes from the hours in a stunning, asymmetric design. These timepieces showcase the brandÕs proven expertise at turning a piece of watchmaking tradition into a contemporary talking piece. In this case, the regulator movement acts as an expert enabler for the external appearance. The result is a statement of accuracy and elegance, for wearers who appreciate original horological architecture with an eye catching twist.