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Rolex 1030

Probable

Found in the earliest Submariner and Explorer references. Its significance to an examiner is chronological: a 1030 places a watch firmly in the 1950s, so a 1030 in a reference that never carried one is a movement question, and the 15xx caliber that succeeded it in a genuinely early case is far more likely to be a service replacement than a fake.

Specifications

Movement manufacturer
Rolex
Production
1950–1959
Winding
automatic
Complications
Centre seconds

Architecture

Rolex's first in-house-designed full-rotor automatic of the modern Oyster Perpetual era, replacing the earlier bumper mechanisms. Centre seconds, no calendar.

Service practice

Seventy-year-old automatic assemblies are routinely rebuilt with later parts, and Rolex's own service network replaced whole movements as a matter of course. A 1950s Oyster carrying a later caliber is a service history and is normal; it affects originality and value and is not a finding against the watch.

References using this caliber

Provenance of this record

Sources & Evidence

Secondary sourceSpecialist publication

Dowling, James M. & Hess, Jeffrey P. — The Best of Time: Rolex Wristwatches

Schiffer Publishing

Published
2006-01-01

Cited for

This referenceProbable
Secondary sourceCollector research

Ranfft Watch Movement Archive

Dr. Roland Ranfft (archived and maintained by volunteers)

Accessed
2026-08-18

Cited for

This referenceProbable
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Last verified: Not yet reviewed