Omega - De Ville Co-Axial - 4831.51.31 - Men - 2000-2010

Omega De Ville Co-Axial Chronometer 4831.51.31 – 38 mm – automatic – Co-Axial – chronometer – black dial – date Classic Omega De Ville Co-Axial Chronometer with black dial, polished stainless steel case and black leather Omega strap with folding clasp. This reference 4831.51.31 is powered by the automatic Omega caliber 2500 with Co-Axial escapement and chronometer certification. The case officially measures 37.5 mm and is commonly referred to as 38 mm. The design is subdued and classical, with applied indices, a central seconds hand and a date window at 3 o’clock. The black dial shows clear signs of aging/surface marks. In particular around the lower and central portions there are locally small irregularities and pin-point spots visible. This seems to be more in or on the finish/paint layer of the dial rather than solely reflections from the glass. This is accounted for in the standing description below. ────────────────── Basic information Brand: Omega Collection: De Ville Model: Co-Axial Chronometer Reference: 4831.51.31 Case diameter: 37.5 mm / approx. 38 mm Case material: stainless steel Dial: black Glass: domed sapphire crystal حركة: automatic Caliber: Omega 2500 Escapement: Omega Co-Axial Certification: chronometer Frequency: 25,200 alternations per hour / 3.5 Hz Power reserve: approximately 48 hours Functions: hours, minutes, central second and date Water resistance according to model specification: 10 bar / 100 meters Case back: closed stainless steel back Bracelet: black Omega leather strap Clasp: Omega deployant clasp Swiss Made ────────────────── Important details • Classic Omega De Ville in 38 mm size • Automatic Omega caliber 2500 • Co-Axial escapement • Chronometer-certified movement • Black dial with applied indices • Date window at 3 o’clock • Domed sapphire crystal • Signed Omega crown • Omega leather strap • Omega deployant clasp • Closed back with De Ville emblem • Timegrapher reading of +1 second per day ────────────────── Estimated year of manufacture Estimated production period: circa mid/late 2000s. The De Ville Co-Axial models from this generation are among the earlier Omega watches to use the Co-Axial caliber 2500. Without accompanying dated documentation, no exact individual manufacture year is given. ────────────────── Case The round case is made of stainless steel and features the characteristic elegant styling of the De Ville series. Diameter: 37.5 mm, rounded to about 38 mm Material: stainless steel Finish: predominantly high-gloss polished Lug width: about 19 mm Bezel: fixed polished steel bezel The case has gracefully shaped lugs and a relatively slim profile, making the watch wear elegantly on the wrist despite its classic size. On the polished surfaces there are light signs of use and fine hairlines. There are no noticeable heavy dents or major damages visible. ────────────────── Dial The black dial has a classic, almost fully monochrome appearance. Applied polished baton indices Omega logo and OMEGA signature under 12 o’clock The Ville signature above 6 o’clock CO-AXIAL CHRONOMETER Minute scale along the outer edge SWISS MADE at the bottom of the dial The hour and minute hands are coated with luminescent material. A slim central seconds hand completes the time display. The dial shows aging and surface marks. Especially in the lower and central areas, there are small pin-point irregularities and spots distributed. Also around several indices the finish is not entirely uniform. The appearance is consistent with localized oxidation/aging of the surface or lacquer finish of the dial. The exact cause cannot be determined without disassembly. Therefore this is not described as merely dirt or reflection. The inscriptions, indices and overall readability are still clearly present. ────────────────── Date At 3 o’clock there is a rectangular date window with a light date disc and dark numerals. The date forms a practical but discreet element of the otherwise klassic design. ────────────────── Movement Inside lies the automatic Omega caliber 2500. Type: mechanical automatic Caliber: Omega 2500 Escapement: Co-Axial Frequency: 25,200 alternations per hour / 3.5 Hz Power reserve: approximately 48 hours Certification: chronometer Functions: hours, minutes, seconds and date The caliber 2500 marks an important chapter in Omega’s modern history, as it belongs to the early generations of Omega watches with the Co-Axial escapement. ────────────────── Timegrapher reading The current snapshot shows the following values: Rate deviation: +1 second per day Amplitude: 318° Beat error: 0.0 ms Lift angle: 52.0° Frequency: 25,200 alternations per hour The observed rate deviation is very small during this measurement, and the beat error is 0.0 ms. The timegrapher reading reflects a momentary state in the measured position and is not a guarantee of daily accuracy on the wrist or the future mechanical condition of the movement. ────────────────── Glass The watch is fitted with a domed sapphire crystal. Because of the curved shape, considerable light reflections can occur depending on the viewing angle. The crystal generally appears neat, without obvious heavy damage. ────────────────── Crown The grooved crown features the Omega logo. The crown is well integrated between the case shape and the lugs and allows winding the watch and setting the time and date. ────────────────── Case back The closed stainless steel case back is secured with multiple screws. In the center there is a medallion with the De Ville emblem and the text: CO-AXIAL ESCAPEMENT The back combines brushed and polished surfaces. There are normal light signs of use and fine scratches. ────────────────── Bracelet The watch is equipped with a black Omega leather band with a crocodile/alligator texture. The inside is marked with Omega branding and reference marks. The band shows signs of wear and slight deformation from wear, but presents itself as well-kept. The current configuration fits a wrist circumference of about 20–21 cm, depending on the chosen setting. ────────────────── Clasp A signed Omega stainless steel deployment clasp is fitted. The clasp features a large OMEGA logo and shows light scratches and normal signs of use on the metal surfaces. ────────────────── Water resistance The original model specification is 10 bar / 100 meters. With a pre-owned watch, the actual water resistance cannot be inferred solely from the factory specification. For use in or around water, a current pressure test is recommended. ────────────────── Condition Case: good used condition with light hairlines and surface scratches Bezel: light signs of wear on the polished finish Crystal: good condition with no noticeable heavy damage Dial: visible aging/surface marks and localized pin-point deterioration of the black finish Indices: present, with locally mild aging marks Hands: good used condition Crown: signed and with normal signs of use Case back: light scratches and signs of wear Bracelet: used condition with wear marks and slight deformation Deployant clasp: light to normal usage scratches ────────────────── Overall condition A classically styled Omega De Ville Co-Axial Chronometer with a compact size of about 38 mm, black dial and automatic Omega caliber 2500. Technically, the watch shows a rate deviation of +1 second per day, an amplitude of 318° and a beat error of 0.0 ms on timegrapher testing. cosmetically, the case presents neatly with normal light signs of wear. It is important to note the black dial: it shows scattered visible pin-point and irregular surface marks, particularly in the central and lower areas. This appears to be due to localized aging or degradation of the lacquer/surface finish and is therefore explicitly noted in the condition description.

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