GMT-Master 1675 — Underline · Underline, Chapter Ring

Underline dial that keeps the chapter ringChapter ringA circular scale around the dial marking divisions of time. On vintage watches, the presence or absence of a ring around the minute track can distinguish dial types.; found on chapter-ringChapter ringA circular scale around the dial marking divisions of time. On vintage watches, the presence or absence of a ring around the minute track can distinguish dial types. Types 2 and 3. Underline dials usually give little or no Geiger reading.