Technical Archive

Omega
Constellation 131.28.34.20.55.001— lug 21mm

Omega Constellation 131.28.34.20.55.001: 21mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Constellation Master Chronometer Small Seconds 34 Stainless Steel / Sedna Gold / Diamond / MOP

Artisanal Note

"This model requires a precise 21mm lug width to preserve the original sartorial balance."

Technical Specifications

Omega 131.28.34.20.55.001
Lug Width
21 mm

The essential strap measurement.

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Reference

131.28.34.20.55.001

Movement

Omega caliber 8802 Hours, Minutes, Small Seconds | Date | Chronometer, Co-Axial Escapement

The Heritage

The Constellation represents one of Omega's historic collections, characterized by the distinctive design with "griffes" on the case. It is powered by the automatic Calibre 8802 with Co-Axial escapement and chronometer certification, featuring hours, minutes, small seconds and date. The 21.15mm lug case integrates the time display functions with date indication.

FAQ

What is the lug width of the Omega Constellation 131.28.34.20.55.001?

The Omega Constellation 131.28.34.20.55.001 has a lug width of 21mm. This is the distance between the spring bar pins of the case. You can verify it by measuring with a digital caliper positioned parallel to the dial, ensuring an accurate measurement to order the correct strap.

What strap material is recommended for the Constellation 131.28.34.20.55.001?

For the Constellation 131.28.34.20.55.001 we recommend straps in fine-grained alligator, net calf, or shell cordovan. Vegetable-tanned alligator develops an elegant patina that ages alongside the watch. Calf offers a more minimalist approach, while cordovan creates a warm complementarity with the Sedna Gold case.

How do I change the strap on my Omega Constellation 131.28.34.20.55.001?

The strap is changed using a dedicated spring bar tool to compress the spring pins. Insert the tool into the small space between the case and strap, press the pin until it clicks, then remove the old strap. Repeat on the other side. Insert the new strap by aligning the holes with the pins and release the spring.

Is an aftermarket 21mm strap compatible with the Omega Constellation 131.28.34.20.55.001?

Yes, any 21mm strap is compatible with the Constellation 131.28.34.20.55.001. Verify that the spring bars of the strap are secured correctly and that the width is exact: even 0.5mm difference can cause lateral wobbling.

How long does a leather strap last on the Constellation 131.28.34.20.55.001?

A quality leather strap (alligator, calf, cordovan) lasts on average 3-5 years with daily use and proper care. Wear depends on humidity, direct sun exposure, and cleaning frequency. Rubber or fluoroelastomer straps last 2-3 years. Casati Milano offers an 18-month warranty on all custom made-to-measure straps.

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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By appointment only · Milan

The atelier's website: casatimilano.com