Laco
Pilot Watches 861801— lug 18mm

The Laco Pilot Watches 861801 features an 18mm lug width, determined by the proportional construction of its 36mm case. This measurement should be verified using a digital calliper positioned in the lateral grooves of the case, from the bottom of the left lug to the bottom of the right lug, excluding any protrusions due to faceted finishing. An error of even 0.5mm results in an incompatible strap or improper fit.

For the 861801, strap selection depends on intended use. A black alligator strap with vegetable tanning delivers formal elegance whilst maintaining the minimalist language of the dial. A tabacco or honey-coloured calf with natural patina amplifies the watch's vintage character. A NATO strap in heavy canvas (1.2mm minimum thickness) represents the historical functional choice for tactical environments or aviation. A vulcanised FKM rubber strap guarantees maximum abrasion resistance for intense daily use. We recommend a deployante on premium leather straps to protect the buckle from constant skin contact and reduce mechanical stress on the stitching.

To change the 861801 strap, you must remove the spring bars (elastic pins) that secure the strap to the case lugs. Use a dedicated spring bar tool to apply perpendicular pressure to the pins, releasing the strap from the opposite side. The new 18mm strap must be positioned with its holes aligned to the lugs; the pins must then be reinserted and locked firmly. This operation requires care to avoid scratching the stainless steel case; if uncertain, consult a professional watchmaker.

Yes, the 861801 is fully compatible with aftermarket straps provided the lug width is exactly 18mm. Bespoke artisanal straps offer superior construction quality compared to OEM variants, allowing customisation of leather, buckle, deployante, and stitching. Always verify that the strap features correct spring bars (standard 1.5mm diameter) and that total lug-to-lug length is compatible with case geometry. Custom straps additionally permit differentiated patina development and ageing over time.

Leather strap longevity depends on intensity of use, tanning type, and maintenance practice. Vegetable-tanned calf worn daily under normal conditions maintains structural integrity for 3-5 years before requiring reconditioning (cleaning, polishing, treatment with natural waxes). Alligator or shell cordovan, owing to superior fibre density, resist deterioration for 5-7 years or longer. Natural patina development over time increases aesthetic value. Factors reducing longevity: prolonged humidity exposure, temperature extremes, salt perspiration, contact with fresh water. A vulcanised FKM rubber strap maintains integrity for 8-10 years without appreciable aesthetic variation.