Hamilton · Railroad

Strap for Railroad 44 Chrono Stainless Steel / Black

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter44 mm
ReferenceH40656731
FamilyRailroad
MovementHamilton caliber H-21 [date] hours, minutes, small seconds | date | Chronograph
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Railroad H40656731

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Railroad H40656731, seen from the bench

The Hamilton Railroad H40656731 is the modern evolution of an American watchmaking legend, embodying the heritage of railroad chronometers that ensured punctuality on major twentieth-century transamerican rail lines. This 44-millimeter steel case model houses the Hamilton H-21 automatic movement with integrated chronograph and date function, featuring a clean cylindrical design with marked edges reminiscent of locomotive instrumentation. The 22-millimeter lug width requires a custom strap, as most standard solutions cover only 20mm or 24mm, and is precisely calibrated to achieve optimal proportions between case mass and strap width.

Frequently asked questions

What is the exact lug width of the Hamilton Railroad H40656731?

The Hamilton Railroad H40656731 features 22-millimetre lugs. This measurement is calculated between the two horizontal pins integrated into the case. It is essential to verify this dimension before purchasing an aftermarket strap, as 22mm does not correspond to the most common standards (20mm or 24mm). Measure the internal distance with a calliper or millimetre ruler positioned perpendicular to the lugs.

Which strap is most suitable for the Hamilton Railroad H40656731?

For this model, we recommend straps in vegetable tanning (such as Tuscan Leather Tobacco Brown) that enhance the industrial and vintage character of the timepiece, or alligator for absolute tactile sophistication. NATO and ballistic fabrics are ideal if you seek practicality and durability in daily wear. Shell cordovan and fine calf offer hardness and visible ageing over time. Your choice depends on usage: for formal contexts, choose structured leather; for daily-sport use, opt for fabric or rubber.

How do you change the strap on the Hamilton Railroad H40656731?

The H40656731 uses a fixed lug system integrated into the case. Gently remove the old strap by inserting the locking pins (which connect strap and lugs) inward using a dedicated tool or fine point. Extract the pin, slide the strap out of the lugs and insert the new one, ensuring it is perfectly aligned at 22 millimetres. Never force it: a correctly sized strap enters smoothly, without resistance.

Can I use an aftermarket strap on this Hamilton Railroad?

Yes, provided the lug width is exactly 22 millimetres. Quality aftermarket straps (leather, alligator, NATO) are compatible with the H40656731's fixed lug system. However, it is essential to verify the strap specifications before purchase: some manufacturers incorrectly list measurements. We recommend straps from specialised suppliers that guarantee dimensional accuracy and construction quality.

How long does a leather strap last on the Hamilton Railroad H40656731?

Durability depends on material and usage. A vegetable-tanned strap (Tuscan or similar) lasts 2-4 years with moderate daily wear, developing a noble patina. Alligator is more durable, 4-6 years. Shell cordovan exceeds 6 years due to its density. Rubber and NATO fabrics offer 5-7 years before showing wear. Leather requires periodic maintenance: avoid prolonged moisture, clean with a soft cloth and occasionally apply wax or oil designed for leather to maintain elasticity and shine.

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