Hamilton Jazzmaster Regulator Automatic Movement Hamilton Swiss watches by wholesalewatches - December 30, 20150 Hamilton Jazzmaster Regulator ,a watch with separate dials for hours, minutes, and seconds, the clocks provided an easy way to get a precise read on the time when setting other devices. What make me feel surprised is its size. At 42mm, the stainless steel case isn’t gargantuan, however, a large dial