The regulator clock gained traction in late seventeenth century watchmaking, before the time of radio-controlled master clocks. Their main purpose was to provide a central point of reference for clock and watch makers in a workshop. 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. Regulator wristwatches, however elegant and interesting, can sometimes suffer from illegibility due to small dials and difficult layouts. However, with the Hamilton Jazzmaster Regulator, a traditional vertical layout is swapped for a more asymmetric design, resulting in an unexpectedly modern take on this old relic, and it's available for a reasonable price.