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Hamilton · Khaki Field

Strap for Khaki Field Mechanical 38 Blue

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 strapsAll Hamilton
Lug width20 mm
Case diameter38 mm
ReferenceH69439940
FamilyKhaki Field
MovementHamilton caliber H-50 ND hours, minutes, seconds
Year2024
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Khaki Field H69439940

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Khaki Field H69439940, seen from the bench

The Hamilton Khaki Field Mechanical 38 Blue model H69439940 features a 38mm stainless steel case with 20mm lug width. It is powered by the H-50 ND calibre, a manual-wind mechanical movement offering reliable everyday performance. The watch preserves the functional aesthetic of military-issue chronometers from the 1960s, with a brushed dial, Mercedes hands, and Super-LumiNova indices for low-light readability. Water resistance is rated to 100 metres.

Frequently asked questions

What is the lug width of the Hamilton Khaki Field H69439940?

The lug width of the H69439940 is 20 millimetres. This measurement represents the distance between the lateral attachments of the case and determines compatibility with aftermarket straps. You can verify it by measuring the internal space between the lugs using a digital calliper.

Which strap pairs best with the Khaki Field H69439940?

It depends on your use case and aesthetic preferences. A vegetable-tanned shell cordovan strap enhances the brushed sunburst dial; dark alligator offers durability and formality; military-issue NATO emphasises the tactical character. The standard 20mm width accommodates infinite customisation options without aesthetic compromise.

How do I change the strap on the Hamilton H69439940?

Position the watch on a soft pad and locate the lateral spring bars connecting the strap to the case. Using a spring bar tool, gently push the pin from one side to release it from the previous strap's lug hole. Align the new strap's holes with the pins and ensure both sides are firmly seated. Never force the movement.

Can I use an aftermarket compatible strap with the H69439940?

Yes, entirely. The standard 20mm lug width allows you to pair the Khaki Field with any quality aftermarket strap, from artisanal leathers to technical NATOs. Verify that the internal width measures exactly 20mm for a seamless fit.

How long does a leather strap last on the Hamilton Khaki Field H69439940?

A quality leather strap typically lasts 3–7 years with daily wear, influenced by sun exposure, humidity, and maintenance. Shell cordovan tends to last longer owing to fibre density. Rotating periodically between different straps significantly extends the lifespan of each.

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