Hamilton · Khaki Aviation

Strap for Khaki Aviation X-Wind Automatic Silver / Rubber

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

Lug width22 mm
Case diameter45 mm
ReferenceH77726351
FamilyKhaki Aviation
MovementHamilton caliber H-21 [day - date] hours, minutes, small seconds | date, day | 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 Khaki Aviation H77726351

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Khaki Aviation H77726351, seen from the bench

The Hamilton Khaki Aviation H77726351 is a 45mm stainless steel chronograph powered by the Hamilton caliber H-21 mechanical movement, featuring Day-Date, hours, minutes, and small seconds functions. With a 22mm lug width, this instrument-grade pilot's watch combines 316L steel corrosion resistance with a sapphire crystal in a design rooted in U.S. military aviation heritage since World War I.

Frequently asked questions

What is the exact lug width of the Hamilton Khaki Aviation H77726351?

The lug width of the Hamilton Khaki Aviation H77726351 is precisely 22 millimetres. This measurement is taken as the linear distance between the two inner holes of the lugs where the strap is secured. To verify, measure between the centres of the attachment holes: it must be exactly 22mm.

Which strap do you recommend for the Hamilton Khaki Aviation H77726351?

For the Khaki Aviation H77726351, we recommend high-quality alligator straps with fine grain and natural patina, or shell cordovan for those seeking exceptional durability and aging characteristics. For practicality, dense NATO textile or vegetable-tanned calf leather maintains the avionic aesthetic with reduced maintenance. All our 22mm straps are available with stainless steel deployante buckles.

How do I change the strap on the Hamilton Khaki Aviation H77726351?

Strap replacement on the Khaki Aviation H77726351 is performed using a spring bar tool. Gently press the inner pin of the lug to compress the internal spring, then extract the old strap from the lugs. Insert the new 22mm strap and release the pin: the spring returns to position. Avoid excessive force, as the pins are delicate.

Is the Hamilton Khaki Aviation H77726351 compatible with any 22mm aftermarket strap?

Yes, the Khaki Aviation H77726351 accepts any aftermarket strap with a 22mm lug width, provided the strap thickness is appropriate (4–4.5mm recommended for fine leather, 1.5–2mm for NATO). Verify that the width is genuinely 22mm: some manufacturers use approximate measurements. Our artisanal 22mm straps are precision-measured to half-millimetre tolerances and tested on this case.

How long does a leather strap typically last on the Hamilton Khaki Aviation H77726351?

Leather strap longevity depends on material and wear patterns. High-quality alligator or shell cordovan lasts 4–6 years with moderate daily use; vegetable-tanned calf resists 3–4 years; dense NATO textile reaches 5–7 years. Primary wear occurs at the buckle contact zone and the strap tip. Regular conditioning every six months significantly extends service life.

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