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Omega · Constellation

Strap for Constellation Co-Axial 31 Yellow Gold / MOP

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Omega
Lug width20 mm
Case diameter31 mm
Reference123.50.31.20.05.002 (aka: 12350312005002)
FamilyConstellation
MovementOmega caliber 8521 hours, minutes, seconds | date | chronometer, co-Axial escapement
CaseYellow Gold

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Straps for the Constellation 123.50.31.20.05.002 (aka: 12350312005002)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Constellation 123.50.31.20.05.002 (aka: 12350312005002), seen from the bench

The Omega Constellation 123.50.31.20.05.002 is a modern evolution of an icon introduced in 1952, when Omega released its first certified chronometer for absolute precision. This 31mm yellow gold model features the Co-Axial caliber 8521, an automatic movement with innovative escapement designed to reduce friction and enhance longevity. The iconic four yellow gold claws protecting the sapphire crystal represent Omega's historical elevation of crystal protection standards. The transparent caseback allows viewing of the hand-finished movement. Lug width is 20mm.

Frequently asked questions

What is the lug width of the Omega Constellation 123.50.31.20.05.002?

The lug width is 20mm. This is the distance between the two metal pins that connect the strap to the case. Measure this dimension precisely before purchasing an aftermarket strap to ensure perfect compatibility.

Which strap is recommended for the Omega Constellation 123.50.31.20.05.002?

A cognac-toned alligator or vegetable-tanned calf are the most sophisticated choices to enhance the yellow gold case. For daily and versatile use, vegetable-tanned brown calf allows natural development of an aged patina. A grey or khaki NATO offers contemporary practicality, while a bordeaux shell cordovan guarantees character and marbled patina over time.

How do you change the strap on the Omega Constellation?

The strap is attached to the lugs via small removable pins. Use a strap removal tool (available online) to gently push the pin from one side to the other. Never force it: the pin should slide with ease. After changing, verify that the strap is aligned with the case. Casati Milano also offers professional strap change assistance.

Can I use aftermarket straps on this Omega Constellation?

Yes, provided the lug width is 20mm. Quality aftermarket straps allow you to personalize the watch while maintaining case integrity. Choose premium leathers (alligator, shell cordovan, vegetable-tanned calf) to not compromise the watch's aesthetics. Avoid inferior quality straps that could cause premature wear to the lugs.

How long does a natural leather strap last on a daily worn watch?

A quality leather strap, with regular maintenance, lasts from 3 to 5 years under normal use conditions. Durability depends on frequency of use, climate (humidity and heat accelerate aging), and maintenance. Vegetable-tanned straps tend to last longer thanks to greater fiber resistance. Well-maintained shell cordovan and alligator can exceed 7-8 years.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only