Technical Archive

Hamilton
Khaki Aviation H64666735— lug 20mm

Hamilton Khaki Aviation H64666735: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Khaki Pilot Auto Chrono

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Hamilton H64666735
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

H64666735

Movement

Hamilton caliber H-31 Hours, Minutes, Small Seconds | Date | Chronograph

The Heritage

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.

FAQ

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.