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The Encyclopedia of Horology

Wristwatch · Datejust wristwatch

Rolex Datejust 1601/3 Blue Sigma Dial

Partially verified

Featuring a 36mm stainless steel case, it is accented by an 18-karat yellow gold fluted bezel and a matching steel and yellow gold Rolesor Jubilee bracelet. The watch displays a matte blue "Pie-pan" dial, which includes the "Sigma" Greek character (σ) markers at the periphery, identifying the use of precious metal components. The dial is appointed with gold-tone indices, featuring wider markers at the 6 and 9 o'clock positions. Equipped with a mechanical automatic "slow-setting" movement, the watch includes a date display magnified by a cyclops lens. The bracelet is a folded Jubilee design, reference 6252H, fitted with 255 end links. According to the provided documentation, the timepiece has undergone professional service and is in operational condition.

Rolex Datejust 1601/3 featuring a blue Sigma dial and two-tone Jubilee bracelet.
Rolex Datejust 1601/3 featuring a blue Sigma dial and two-tone Jubilee bracelet. — Zamanito / Bulang & Sons. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Datejust wristwatch
Maker / attribution
Rolex
Reference
1601/3
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1977
Source-reported place
سوئیس
Source-reported serial
513xxxx

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Design

The wristwatch utilizes a 36mm stainless steel Oyster case. A hallmark of the reference 1601/3 is the 18-karat yellow gold fluted bezel, which contrasts against the steel middle case and lugs.

The dial is a matte blue finish with a stepped 'Pie-pan' geometry. Gold-tone indices are applied, with the markers at the six and nine o'clock positions appearing notably wider. Sigma symbols flanking the 'T SWISS T' text signify the use of precious metals for indices and hands, a convention used in the 1970s.

Evidence for this section
  • “بدنه ساعت با قطر ۳۶ میلی‌متر از جنس فولاد ساخته شده و با یک زه شیاردار (Fluted bezel) از جنس طلای زرد ۱۸ عیار احاطه شده است.”

Movement and Bracelet

The movement is a self-winding automatic caliber characterized by a 'slow-setting' date mechanism. According to the provided source, the internal mechanism has been fully serviced by a watchmaker to ensure functional performance.

The timepiece is fitted with a folded Jubilee bracelet, designated as reference 6252H. The bracelet attaches to the case using 255-reference end links, maintaining visual and technical consistency with the manufacturing era of the watch.

Evidence for this section
  • “موتور اتوماتیک خودکوک از نوع تنظیم آهسته تاریخ (Slow-setting) است. طبق اعلام فروشنده، موتور ساعت توسط ساعت‌ساز به‌طور کامل سرویس شده”
  • “بند ساعت از نوع جوبیلی با حلقه‌های تاشده (Folded Jubilee) با رفرنس 6252H و قطعات انتهایی رفرنس 255 است”

Technical Verification

This includes an independent assessment of the case edge finishing, which may have been affected by previous polishing, and the authenticity of the Sigma dial prints.

It is suggested that the reference alignment between the case and the bracelet be checked to confirm the assembly remains consistent with factory standards of the period.

Evidence for this section
  • “علاقه‌مندان و خریداران بهتر است در هنگام بررسی، تطابق دقیق رفرنس بدنه و بند، اصالت دست‌نخورده بودن پرداخت‌های لبه‌های قاب و اصالت جزئیات چاپ صفحه سیگما را به‌صورت مستقل ارزیابی نمایند.”

Open research questions

  • Does the movement caliber strictly align with the 513xxxx serial range for this specific reference?
  • Is there further documentation regarding the scope of the claimed professional service?

Source evidence

Recorded claims and source quotations for Rolex Datejust 1601/3 Blue Sigma Dial
FieldSource-reported valueSource quotation
MakerRolex“برند: Rolex”
Reference1601/3“شماره رفرنس: 1601 / 1601-3”
Serial number513xxxx“شماره سریال: 513xxxx (مربوط به سال ۱۹۷۷)”
Year of production1977“سال ۱۹۷۷”
Case materialStainless steel and yellow gold“از ترکیب فولاد ضدزنگ و طلای زرد ساخته شده”
Bezel18-karat yellow gold fluted bezel“زه شیاردار (Fluted bezel) از جنس طلای زرد ۱۸ عیار”
BraceletFolded Jubilee with 6252H reference“از نوع جوبیلی با حلقه‌های تاشده (Folded Jubilee) با رفرنس 6252H”

Visible details

  • Blue matte Pie-pan style dial with applied gold markers
  • Two-tone steel and yellow gold Rolesor construction
  • Sigma characters flanking the T SWISS T printing at the bottom of the dial
  • Folded Jubilee bracelet with 255 end links

Research qualifications

  • Requires independent verification of edge finishing on the case
  • Independent evaluation recommended for the authenticity of the Sigma dial markings

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

Rolex Datejust 1601/3 Blue Sigma Dial in Steel and Yellow Gold

Reviewed 2026-11-02 · Record 33a2c0c51c

Terms in this record

Glossary explanations for terms named in this object’s record.

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