Skeleton, digital, and purposefully bare dials where the movement or the dial surface itself is the display.
No-numeral dials carry no hour markers of any kind, the dial surface, the movement, or a digital display is the visual field. The category covers skeleton watches (where the movement plates and bridges are the display), digital watches (Casio G-Shock, Urwerk satellite hours, Ressence rotating disc system), and a handful of purposefully minimal dials that use no marker at all (the Piaget Altiplano in some configurations). Richard Mille's skeletonized references and the MB&F Horological Machine series fall here. The no-numeral format is either technically demanding (skeleton finishing) or conceptually radical (rejecting the traditional watch-face grammar entirely).
