GMT-Master 1675 — Gilt Dial · Pointed Crown Guards, Chapter Ring

Rolex 1565

MicrostellaMicrostellaRolex’s system of small adjustable screws or nuts on the balance wheel, used to change its inertia and regulate the watch’s rate. Introduced as screws in 1957 and developed into nuts in 1983, it allows rate adjustment with the movement still cased. The name identifies the Rolex system, rather than every adjustable-inertia balance.-regulated chronometerChronometerA watch or movement certified for timekeeping precision under a defined testing standard. The applicable certification depends on its maker and period; it is not the same as a chronograph. caliberCaliberThe designation of a watch movement, identifying its design or movement family. of the -era 1675, used until about 1965–66 (around serial 1.4M), when the 1575 replaced it.