Hamilton · Khaki Aviation

Strap for Khaki Aviation Pilot Day Date Auto 42 Stainless Steel / Green

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter42 mm
ReferenceH64635560
FamilyKhaki Aviation
MovementHamilton caliber H-30 Hours, Minutes, Seconds | Date, Day
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 H64635560

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Khaki Aviation H64635560, seen from the bench

The Hamilton Khaki Aviation H64635560 is a 42mm stainless steel pilot watch with a 20mm lug width, powered by the H-30 automatic movement with approximately 80 hours power reserve. The satin aluminum dial features applied white gold indices and Arabic numerals, a date and day window, and anti-reflective sapphire crystal with 100-meter water resistance. Rooted in Hamilton's 1940s aviation heritage for military pilots, this instrument prioritizes legibility and function over aesthetic appeal.

Frequently asked questions

What is the lug width of the Hamilton Khaki Aviation H64635560?

The lug width of the Hamilton Khaki Aviation H64635560 is 20mm. This measurement represents the distance between the two lugs (spring bar pins) that attach the case to the strap. Precise measurement: use a digital calliper positioned perpendicularly between the inner edges of the lugs.

Which strap do you recommend for the H64635560?

For the H64635560 we recommend three categories: vegetable-tanned leather in dark brown or cognac with deployant buckle (instrumental elegance), canvas NATO in black or olive green (military versatility), Tropic rubber in navy or black (resistance and comfort). Choice depends on usage: leather for balanced contexts, NATO for outdoor activities, rubber for humid environments or frequent temperature changes.

How do I change the strap on my Hamilton Khaki Aviation H64635560?

Strap change is executed using a spring bar remover tool (specific pincer): position the flat tip on the spring mechanism, apply slight inward pressure and extract the pin. Repeat on the opposite side. Insert the new strap by aligning the holes to the lug ends, then reinsert the pins until they click into place. Operation requires 2-3 minutes without aggressive tools.

Are MilanoStraps aftermarket straps compatible with the H64635560?

Yes. All straps in the MilanoStraps 20mm collection are guaranteed compatible with the H64635560. Every strap is constructed with structured lugs designed to accommodate standard 20mm pins and undergoes visual centering inspection to ensure perfect alignment between case and strap during fitting.

How long does a leather strap last on a watch like the H64635560?

A quality, vegetable-tanned leather strap lasts an average of 3-5 years with regular use (worn 4-5 days per week). Lifespan depends on frequency of use, sun exposure, ambient humidity and maintenance. Occasionally applying specific leather balm (every 6-8 months) significantly extends useful life. The patina that forms is predictable and appreciated: leather ages visibly, transforming into evidence of authentic usage.

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