Rolex - Datejust 31 – Black Roman – 178240 – Circa 2004

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Year:  Circa 2004

Reference number:  178240

Accessories:  Watch Only

Material:  Stainless Steel

Color Dial: Black Roman

The Rolex Datejust 31 brings the proportions of the classic Datejust to a refined 31mm case, a size that sits elegantly on the wrist while keeping every element that has made the Datejust an icon since 1945: the Oyster case, the date window at 3 o'clock and the magnifying Cyclops lens. The reference 178240 is the stainless steel version with a smooth domed bezel, giving it a clean, understated profile. This configuration pairs a black dial with Roman numeral hour markers for a crisp, timeless look.

Inside is the Rolex calibre 2235, a self-winding mechanical movement manufactured in-house and designed specifically for Rolex's mid-size and ladies' Oyster models. It drives the hours, minutes, central seconds and an instantaneous date, with a power reserve of approximately 48 hours. The screw-down winding crown and Oyster case provide water resistance to 100 meters, and the watch is completed by the three-piece link Oyster bracelet.

Specifications

• Brand: Rolex
• Collection: Oyster Perpetual Datejust
• Model: Datejust 31
• Reference: 178240
• Case: Stainless steel (904L)
• Case Diameter: 31mm
• Dial: Black
• Hour Markers: Roman numerals
• Movement: Rolex calibre 2235, self-winding mechanical
• Power Reserve: Approximately 48 hours
• Frequency: 28,800 vph (4 Hz)
• Jewels: 31
• Crystal: Sapphire with Cyclops lens over the date
• Water Resistance: 100 meters
• Strap/Bracelet: Oyster bracelet, stainless steel
• Functions: Hours, minutes, central seconds, instantaneous date
• Special Features: Superlative Chronometer (COSC certified)