Laco
Chronographs 861789— lug 20mm
Laco Chronographs 861789: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Laco 861789The essential strap measurement.
Browse 20mm straps →861789
Miyota caliber 0S10 Hours, Minutes, Small Seconds | Date | Chronograph
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Chronographs
FAQ
What is the exact lug width of the Laco Chronographs 861789?
The Laco Chronographs 861789 features a lug width of exactly 20 millimetres. This measurement, taken from the inside of the lug between the two clips that retain the case pins, is critical for aftermarket strap compatibility. A strap with incorrect tolerance (19.5mm or 20.5mm) will result in unacceptable visual gaps or friction during wear. We recommend verifying this measurement with a digital calliper or consulting our team at the Casati Milano atelier.
Which strap is most suitable for the Laco Chronographs 861789?
The choice depends on your intended usage. For evening elegance: black alligator with titanium or steel deployante. For daily wear with aesthetic evolution: vegetable-tanned calf leather (dark brown or burgundy), which will develop a unique patina over time. For sports or humid environments: black vulcanised rubber with nylon stitching. For versatility and historical accuracy: grey or blue ballistic canvas NATO. The Casati Milano Atelier offers personalised in-person consultation to select the ideal material and colour for your timepiece.
How do you change the strap on a Laco Chronographs 861789?
The strap is secured to the case via two spring bars (pins) that pass through the lugs. To remove the strap: 1) obtain a spring bar tool (a specialist instrument, never scissors); 2) position the tool tip in the small hole beneath the lug to compress the internal pin; 3) gently extract the pin from the case. Repeat on the opposite side. Insert the new strap in reverse order, ensuring the pins are fully seated and the strap sits flush against the case.
Is an aftermarket strap compatible with the Laco Chronographs 861789?
Yes, provided the lug width is precisely 20mm. Milanostraps.it offers a comprehensive catalogue of 20mm straps in alligator, vegetable-tanned calf, rubber and NATO—all tested for mechanical and aesthetic compatibility with the 861789. Each strap is supplied with 20mm stainless steel or titanium spring bars, pre-assembled and ready to fit. The artisanal construction quality of our straps guarantees multi-year durability and superior resistance compared to generic mass-produced alternatives.
How long does a leather strap last on the Laco Chronographs 861789?
Leather strap longevity depends on frequency of wear and environmental conditions. A vegetable-tanned calf strap worn daily in an office setting lasts approximately 3–5 years, developing characteristic patina in the wrist contact zone. If exposed constantly to water, humidity or intense perspiration, lifespan reduces to 1.5–2 years. Alligator, being more resilient, achieves 5–7 years of service. All Milanostraps.it artisanal straps can be regenerated (reconditioned, recoloured, restored) at the Casati Milano Atelier, significantly extending operational life at lower cost than complete replacement.