Hamilton
Khaki Field H89459940— lug 20mm

The lug width is 20mm. This standard width represents the internal distance between the two case attachment points and is essential to ensure strap compatibility. An incorrectly sized lug width would result in lateral instability and accelerated wear on the lugs.

For this field watch, we recommend straps in brown alligator or vegetable-tanned calfskin, which enhance the instrumental character and harmonise with the khaki dial. For robust daily use, vintage nylon NATO straps and technical rubber straps offer practicality and durability. The choice depends on your primary usage context.

Changing the strap requires the use of a specific tool (strap tool or small levers) to eject the spring bars that connect the strap to the case. Place the watch on a soft surface to avoid scratches. If uncertain, entrust the task to a professional. The process takes a few minutes but requires extreme care in handling.

Yes, provided they respect the exact 20mm lug width specification. Straps of artisanal quality, crafted from certified materials (alligator, Swiss calfskin, shell cordovan), fit perfectly without altering the watch's design. Always verify technical specifications before purchase.

A high-quality leather strap, with vegetable tanning, typically lasts 3 to 5 years with intensive daily use. Longevity depends on humidity, perspiration, sun exposure, and maintenance. The patina that develops—natural darkening and creasing—is a sign of material authenticity, not degradation. Periodic maintenance (gentle cleaning, conditioning) extends its lifespan significantly.