Omega · Railmaster

Strap for Seamaster Aqua Terra 150M Hand Wound 49.2 Railmaster Stainless Steel / Red MOP

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter49 mm
Reference2806.77.40 (aka: 28067740)
FamilyRailmaster
MovementOmega caliber 2201 hours, minutes, small seconds
Year2003 - 2010
CaseStainless Steel

Recommended spring bar

Spring bars Omega 18mm — single diameter

Technical match for lug width and diameter · lug 18 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Railmaster 2806.77.40 (aka: 28067740)

Selected for the 18 mm lug width

All 18 mm straps →

The Railmaster 2806.77.40 (aka: 28067740), seen from the bench

The Seamaster Aqua Terra 150M Hand Wound 49.2 Railmaster is a stainless steel model with a 49.20mm case diameter, powered by the Omega 2201 manual-wind movement featuring hours, minutes, and small seconds. Originally designed in 1957 as a technical instrument with Faraday cage antimagnetic protection, this reference 2806.77.40 maintains the austere design philosophy and functional proportions of the original. The 18mm lug width ensures balanced proportions on the substantial case, allowing compatibility with standard 18mm straps.

Frequently asked questions

What is the lug width of the Omega Railmaster 2806.77.40?

The Omega Railmaster 2806.77.40 is equipped with an 18mm lug width, a standard measurement in the tool watch segment that ensures aesthetic balance on the 49.20mm diameter case. This width allows for a wide range of compatible aftermarket strap options.

What strap is recommended for the Railmaster 2806.77.40?

The best materials depend on your use and style. A black alligator or vegetable-tanned calf emphasize the professional character, while a rubber or NATO strap maintain the tool watch identity. A deployant clasp is the ideal closure to ensure comfort and security on the wrist.

How do I change the strap on my Omega Railmaster 2806.77.40?

Use a spring bar tool to gently release the springs located in the lug slots of the case. Slide the spring bar out from the old strap and insert it into the new strap, then let the spring bar fall into the holes of the new lug. Ensure the spring is fully seated.

Can I mount a third-party brand strap on my Railmaster 2806.77.40?

Yes, any strap with an 18mm lug width is compatible with your Railmaster. Milano Straps offers a wide selection of artisanal 18mm straps, from alligator leather to calf, NATO and rubber, available in our online catalog.

How long does a leather strap last on an Omega like the Railmaster?

A quality leather strap, with vegetable tanning and artisanal construction, lasts 3-5 years with moderate daily wear. Longevity depends on frequency of wear, exposure to moisture and maintenance. Periodic leather conditioning significantly extends the life of the strap.

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