The zipper was patented in 1917 by Swedish-American engineer, Gideon Sundback. It has been adapted (in 2012) by American watch designer, B. Zimmerman, as a way to tell the time.
Observe the labeled dial below. The zipper zips, and then unzips, at regular intervals to denote the time. A study of this diagram will help greatly to understand how The Zipper works as a time-telling method.
The hour of the day is indicated by the Arabic numeral(s) in the circular window at the lower right portion of the dial. The date is indicated by the Arabic numeral(s) in the square window at the lower left portion of the dial. The zipper teeth that are meshed below the slide indicate minutes. Each tooth represents 5 minutes of time. (The unmeshed teeth above the slide do not factor in the time-telling.) Individual minutes are indicated by the number of lit blue dots (0-4) at the top of the watch dial. They add to the minutes gotten from the meshed teeth. The fifth dot at the top, in red, to the right of the 4 blue dots, indicates AM or PM. When unlit, it is AM; when lit, it is PM. It’s that simple!!!
As time passes, the zipper zips. After 12:59, the zipper rapidly unzips to 1:00, with no teeth showing below the slide, none of the blue dots lit, and an Arabic numeral “1” in the circular hour window.
The dial display can be done in LCD and constantly lit, or LED (which requires more energy) and lit when a side button is pressed–to extend battery life. The watch can be made in a variety of color choices as well. It can also be done in a larger (48mm x 43 mm) and/or smaller (45mm x 40mm) version.