Omega Constellation Constellation Co-Axial 31 Stainless Steel / Yellow Gold / MOP

Reference 123.20.31.20.55.002

Omega Constellation Co-Axial 31 Stainless Steel / Yellow Gold / MOP

About this watch

The Omega Constellation Co-Axial 31 is a masterpiece of horology, blending luxury, precision, and history. This stunning timepiece boasts an exquisite design featuring stainless steel and yellow gold, complemented by a captivating Mother of Pearl (MOP) dial that shimmers like the ocean. Underneath lies the renowned Omega caliber 8520 automatic movement, a marvel of engineering with a power reserve of 50 hours and Co-Axial escapement, reducing friction for enhanced longevity and precision. With its water resistance of 100 meters and sapphire glass protection, this watch is perfect for daily wear. The comfortable design and adjustable links ensure a secure fit, while the gem-set indexes add an opulent touch. As a true investment piece, the Omega Constellation Co-Axial 31 combines timeless aesthetics with cutting-edge technology, making it an ideal choice for watch collectors, individuals seeking precision and reliability, and fashion enthusiasts alike.

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Key Features

Omega Caliber 8520 Automatic Movement
Co-Axial Escapement with Reduced Friction
Water Resistance of 100 Meters
Sapphire Glass Protection
Mother of Pearl (MOP) Dial
Stainless Steel and Yellow Gold Construction
Gem-Set Indexes for Opulent Touch

Specifications

Brand

Omega

Family

Constellation

Model

Constellation Co-Axial 31 Stainless Steel / Yellow Gold / MOP

Reference

123.20.31.20.55.002

Movement

8520

Movement Features

Hours, Minutes, Seconds
Date
Chronometer, Co-Axial Escapement

Case

31mm

Dial Color

White

Crystal

Sapphire

Water Resistance

100

Current Listings

OMEGA Constellations Chronometer Certified 168.018 original bracelet, excellent condition

OMEGA - 168.018 · $1,500

This Omega Constellation Chronometer is a certified timepiece featuring an automatic Cal 564 movement and a stainless steel case with a silver dial.

Condition: excellent
Case dimensions: 35 x 40mm, thickness 12mm, 19mm lug width
Movement: Cal 564 Automatic 24 Jewels 19800 beats per hour
Accuracy: +/-5s per day

Posted at

Feb 9, 2026, 10:08 PM

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OMEGA Constellations Chronometer certified 167.021, serviced

OMEGA - 167.021 · $1,300

A rare Omega Constellation Chronometer model 167.021, officially certified and ultra thin, featuring a silver dial and automatic movement.

Condition: Used with normal signs of wear and use
Case dimensions: 33 x 39mm, 8mm thickness, 19mm lug width
Movement type: Cal 712 Automatic, 24 Jewels, 19800 beats per hour
Crystal condition: Acrylic Crystal with no scratches and Omega signed in the center

Posted at

Feb 8, 2026, 8:50 AM

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10k Gold Filled Omega Constellation. STEAL DEAL

Omega - Constellation · $555

This vintage Omega Constellation is a mid-century design in a classic 34mm case that exudes Swiss elegance.

Case size: 34mm

Posted at

Feb 6, 2026, 10:59 PM

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Omega Double Eagle Constellation | Open Case Back Chronograph | Reference 1819.51.91

Omega - 1819.51.91 · $4,900

This Omega Double Eagle Constellation features an open case back showcasing the movement, with a 41MM case size and powered by Co-Axial calibre 3313.

Condition: Excellent Pre-Owned
Case size: 41MM
Crystal status: replaced
Strap type: OEM rubber strap

Posted at

Feb 6, 2026, 2:50 PM

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Omega Double Eagle Constellation | Open Case Back Chronograph | Reference 1819.51.91

Omega - 1819.51.91

a Omega Double Eagle Constellation watch with an open case back chronograph, details to be specified.

Case back type: Open Case Back

Posted at

Feb 6, 2026, 2:47 PM

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Omega Constellation Pie Pan 168.005 w/bracelet | All original | $2500 shipped (SERVICED)

Omega - 168.005 · $2,500

A classic mid-60s Constellation with an iconic pie-pan dial and stainless steel case, powered by Omega's chronometer-rated Caliber 561.

Condition: All original
Movement caliber: Cal. 561 Automatic
Case material: Stainless Steel
Bracelet type: Original Omega bracelet

Posted at

Feb 6, 2026, 11:22 AM

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[WTS] Mint Omega Gold-Capped Constellation White Sunburst Dial - Ref. 168.018 - Caliber 564 Chronometer Automatic Date - From 1969 - $2300 Shipped, Duties Covered!

Mint Omega Gold-Capped Constellation White Sunburst Dial - Ref. 168.018 - Caliber 564 Chronometer Automatic Date - From 1969 - $2300 Shipped, Duties Covered!

Omega - 168.018 · $2,300

This Omega Constellation features a gold-capped case with a crisp sunburst dial and thick hour markers at the quarters. The watch has a 35mm diameter (excluding the crown) and is powered by an excellent caliber 564 automatic movement with date.

Condition: Mint, likely new-old-stock
Movement caliber: 564 Chronometer Automatic Date
Case dimensions: 35mm diameter excluding crown
Lug type: straight lugs

Posted at

Feb 5, 2026, 1:28 PM

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1950s Omega Constellation Calendar Chronometer Certified 2943-1SC, 14k bezel, serviced! - $1365 shipped!!

Omega - 2943-1SC · $1,365

A beautiful vintage Omega Constellation Calendar automatic winding watch, circa 1957, with a 14k solid gold bezel and serviced in 2025.

Condition: 9/10
Case size: 35mm
Caliber: 504 chronometer grade

Posted at

Feb 5, 2026, 7:30 AM

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Vintage Omega Constellation 168.029 Day Date

Omega - 168.029 · $949

A vintage Omega Constellation from the late 1960s to early 1970s, designed by Gerald Genta, featuring a sharp, unpolished case and an original sunburst dial.

Case type: cushion (C-case)
Bezel material: 18k white gold
Bezel style: fluted

Posted at

Feb 2, 2026, 11:01 PM

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