A “Chapter Ring” is specifies a dial that features an enclosed circle around the perimeter with demarcations for each minute/second. These will have thicker demarcations for every 5 hashes. These are most often seen in vintage sport Rolex models, such as Submariners, GMT-Masters, and Explorers.

According to Ashley Davis, the jewelry director at timepiece retailer Wrist Aficionado, the ring watch has had waves of popularity from the early 1900s until now, with Rolex producing many ring watches in the 1930s and 1940s, and the style becoming popular again in the '90s and early 2000s.