Omega · Seamaster

Strap for Seamaster Master Co-Axial 39.5 Swiss Edition Stainless Steel / Silver / Alligator

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 straps All Omega

Lug width20 mm

Case diameter40 mm

Reference511.13.40.20.06.002 (aka: 51113402006002, City Edition)

FamilySeamaster

MovementOmega caliber 8800 hours, minutes, seconds | date | chronometer, co-Axial escapement

Year2018

CaseStainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

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All Omega spring barsOpen →

Straps for the Seamaster 511.13.40.20.06.002 (aka: 51113402006002, City Edition)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Seamaster 511.13.40.20.06.002 (aka: 51113402006002, City Edition), seen from the bench

The Omega Seamaster reference 511.13.40.20.06.002 is powered by the automatic caliber 8800 with co-axial escapement and chronometer certification. The movement offers hours, minutes, seconds and date indication. The case features 20mm lugs.

Frequently asked questions

What lug width does the Omega Seamaster 511.13.40.20.06.002 have?

The Omega Seamaster 511.13.40.20.06.002 features a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20mm. This dimension is standard for Seamaster models of this generation and is crucial for selecting compatible straps without the need for adapters.

What type of strap do you recommend for the Seamaster 511.13.40.20.06.002?

For this model we recommend <a href="/pages/termine-glossario/alligatore">alligator</a> leather or vegetable-tanned calf straps for formal wear, or NATO and rubber straps for more sporty use. The versatility of the 39.50mm brushed steel case allows for both elegant and casual pairings, depending on the leather chosen and its tone.

How do you change the strap on an Omega Seamaster?

The strap is changed by extracting the <a href="/pages/termine-glossario/deployante">spring bars</a> (or lugs) from the lug seats using a dedicated tool (spring bar remover). We recommend proceeding gently to avoid scratching the case. If you are not experienced, the replacement service at Casati Milano is available by appointment.

Is the 511.13.40.20.06.002 compatible with aftermarket straps?

Yes, all straps with a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20mm are compatible. We recommend choosing models with soft lugs to avoid excessive stress on the case lug seats. Our artisanal straps on milanostraps.it are specifically designed for this dimension.

How long does a leather strap last on this watch?

The lifespan depends on the type of leather and the rate of wear. A <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> strap with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> has an average life of 3-5 years with daily use. Our artisanal straps come with an 18-month warranty and can be restored at the Casati Milano atelier.

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