1975 Rolex Datejust 1603 “Sigma Silver”

This Rolex Datejust reference 1603 in steel, crenulated steel bezel, was produced in 1975. It is equipped with a steel Jubilee bracelet. Its “Sigma Dial” is perfectly preserved and sought-after by connoisseurs. The luminescent material dots at the tip of the markers and on the hands have developed a beautiful, homogeneous eggshell patina.
This watch is part of the Datejust 160x series, celebrated for their so-called “pie-pan” dials that exude an unparalleled vintage charm.
In very good overall condition and recently serviced by a qualified watchmaker, this Datejust is an excellent introductory piece for anyone wishing to discover the world of vintage watch collecting, while being perfectly wearable on a daily basis thanks to its manufacturing quality and the reliability of its automatic movement.

Vintage watch enthusiasts will sometimes notice the presence of the “σ” (Sigma) symbol on the dial of watches from prestigious brands, such as Rolex. Introduced in the early 1970s, this symbol was printed to indicate that visible elements, such as hour markers and sometimes hands, were made of gold.

This initiative was encouraged by the Swiss Association for the Industrial Promotion of Gold (APRIOR in French) with the aim of promoting Swiss watches in the face of international competition and highlighting the superior quality of the components used. The use of gold not only increases the intrinsic value of the watch (the price of gold having almost quadrupled between 1970 and 1974), but also enhances its aesthetic with a distinct shine and refined finish.

The presence of the Sigma letter is mainly observed near the words “T SWISS T” at the bottom of the dial. Since all the dials equipped with precious metal decorations do not bear this sign, its presence makes the models boasting it particularly attractive to collectors.

This feature, in addition to being an indicator of quality and luxury, also serves as a point of historical interest, illustrating a time when the Swiss watch industry sought to stand out through the unparalleled quality of its products.

The movement that powers this Datejust, mechanical with automatic winding, Rolex caliber 1570, has recently undergone a complete overhaul by a watchmaker specializing in vintage models, and operates within the strictest tolerances.

This beautiful Datejust is in excellent overall condition.
The well-preserved case features wide, satin-finished lugs as when this watch was born in 1975. The crenulated steel bezel is well-defined, with sharp striations and shiny facets.
The Sigma silver dial is free of any defects, and the tritium luminous dots are whole, round, and evenly patinated. During a recent overhaul, the plexiglass crystal was replaced with a new one for perfect transparency.
The Jubilee bracelet, a few years newer than the watch and sturdier than the models Rolex fitted in the early 1970s, is preserved in excellent condition. The stamped Rolex crown on the buckle is perfectly crisp.
The movement that powers this Datejust, mechanical with automatic winding, Rolex caliber 1570, has recently undergone a complete overhaul by a watchmaker specializing in vintage models, and operates within the strictest tolerances, with an impeccable reading of ±0 seconds/day, 296° amplitude, and 0.2 ms beat error.
In short, a watch that's almost 50 years old and yet ideally preserved both aesthetically and mechanically!

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