1973 Rolex Datejust Ref. 1603 in Steel – “Blue Sigma” Dial

This Rolex Datejust reference 1603 produced in 1973 (serial number 347xxxx) features one of the most sought-after dials of this period: the matte blue "pie-pan" variant. Here, the dial further features two "σ" symbols (the lowercase Greek letter Sigma) on either side of the "T SWISS T" marking at 6 o'clock, indicating that the markers and hands are made of white gold. This “Blue Sigma” configuration is particularly sought after by collectors.
The 36 mm steel case, with its characteristic engine-turned bezel, houses the Rolex caliber 1575, a robust, reliable, and precise automatic movement, chronometer-certified by the COSC.
The example we have the pleasure to offer is distinguished by the superb uniform orange patina of the luminescent material (tritium base) of the indexes and hands – a sought-after natural evolution which gives the dial a unique depth and warmth, thanks to the contrast with the deep blue of its background.
The Jubilee bracelet reference 6251H with folded links and 55 end pieces, the original configuration for this period, harmoniously completes the watch.
This Datejust with Blue Sigma Dial is preserved in excellent overall condition and has undergone a complete overhaul by a watchmaker specializing in vintage calibers.

Vintage watch enthusiasts will sometimes notice the presence of the symbol "σ" (the lowercase Greek letter Sigma) on the dials of prestigious brands, such as Rolex and Patek Philippe. Introduced in the early 1970s, this symbol is used to indicate that the hour markers, and often also the hands, are made of gold. This specification was encouraged by the Association pour la Promotion Industrielle de l'Or (APRIOR) in order to promote Swiss watches in the face of international competition and to highlight the superior quality of the components used. The presence of Sigma symbols is mainly observed near the "T SWISS T" inscription at the bottom of the dial. Since not all dials equipped with precious metal decorations bear this symbol, its presence makes models marked with it particularly attractive to collectors.

This Datejust reference 1603 is preserved in very good overall condition.
The demarcations between the satin/brushed matte and glossy/mirror polished surfaces are clear.
The very attractive matte blue "Sigma" dial shows, at the circle from which the pie-pan starts, discolorations typical of this blue paint. The luminescent material of the indexes and on the hands has developed a superb orange patina, uniform and warm.
The movement that powers our Datejust, a self-winding mechanical Rolex caliber 1575, has recently undergone a complete overhaul by a watchmaker specializing in vintage models, and operates according to the strictest tolerances.
A very nice example!

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