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Hamilton · Khaki Aviation

Strap for Khaki Pilot Auto Chrono

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 diameter42 mm
ReferenceH64666735
FamilyKhaki Aviation
MovementHamilton caliber H-31 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

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Straps for the Khaki Aviation H64666735

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Khaki Aviation H64666735, seen from the bench

The Hamilton Khaki Aviation H64666735 is a professional pilot's chronograph with a 42 mm stainless steel case housing the H-31 automatic movement, featuring small seconds and date window. The bistro dial with applied baton hands ensures legibility in low-light conditions typical of aviation use. Water resistant to 100 metres, it features a 20 mm lug width for strap compatibility. This model perpetuates Hamilton's tradition of supplying chronometers to military pilots since World War I.

Frequently asked questions

What is the lug width of the Hamilton Khaki Aviation H64666735?

The H64666735 features a 20-millimetre lug width. This specification is critical for selecting compatible aftermarket straps: any replacement strap must be exactly 20 millimetres wide at the terminals to fit correctly into the case lugs. There is no tolerance for error; a 22 or 18 millimetre strap will not fit.

Which strap is best suited to the Hamilton Khaki Aviation H64666735?

The choice depends on intended use and personal preference. A shell cordovan strap with vegetable tanning enhances elegance whilst developing natural patina over time. A NATO strap in khaki or grey reinforces the avionic identity. For intensive daily wear, a vulcanised rubber strap ensures grip and durability. Consider your specific context: formal versus casual, dry versus humid climate.

How do you change the strap on the Hamilton Khaki Aviation H64666735?

A spring bar tool is required to carefully lift each lug and extract the metal spring bar securing the strap. Remove one end, then the other. The operation typically takes 2–3 minutes for experienced users, up to 10 for first-timers. Protect the case with a soft cloth to prevent scratching during manipulation.

Which aftermarket straps are compatible with the H64666735?

All straps with a 20-millimetre lug width are compatible. Verify that the strap keeper (passant) slides smoothly around the wrist without obstructing the crown at 3 o'clock. Italian leather straps featuring vegetable tanning offer superior quality to OEM straps, with better aging characteristics and durability.

How long does a leather strap last on the H64666735?

A quality vegetable-tanned leather strap typically lasts 3–5 years of daily wear before requiring replacement, provided exposure to excessive humidity is limited and the strap is cleaned periodically. Durability depends on skin contact and climate conditions. Shell cordovan straps age beautifully but require more maintenance. NATO and rubber straps offer longer lifespan with minimal care.

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