Oyster Perpetual 14203 — White Dial, Roman Numerals

Rolex 3000

High-beat, time-only automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. of the 14270 Explorer, also used in the Air-King and no-date Submariner of its day. A flat hairspringBalance springThe fine spiral spring that works with the balance wheel to form the movement’s oscillator. without overcoil and no regulator; the balance is adjusted by 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. weights, with KIF shock protection.