Strap for Chronographs Paris / Stainless Steel / Black

The lug width of the Laco Chronographs 861870 is 22mm. This is the distance between the two spring bar holes where the strap attaches. To verify, you can carefully remove one spring bar using a spring bar tool and measure the distance with a digital calliper. All straps with a 22mm lug width are compatible with this model.

It depends on usage and aesthetic preference. For formal elegance, vegetable-tanned calf or satin-finished alligator enhances dial readability without tactile compromise. For everyday versatility, premium NATO in asphalt grey is robust and visually neutral. If the 861870 is your travel or light sports chronograph, an FKM rubber strap offers maximum grip when wet. We recommend choosing the material based on your primary use case.

Changing the strap requires a spring bar tool and steady hands. Remove the watch from your wrist. Use the spring bar tool to carefully press the spring bar on one side, sliding out the old strap. Repeat on the other side. Insert the new strap by aligning the holes and let the spring bars snap back into place automatically. If your strap has a deployante or ardillon buckle, the procedure is identical. Avoid forcing—the springs are designed to yield easily when pressed correctly.

Yes, absolutely. An aftermarket strap with 22mm lug width is fully compatible mechanically. Many owners prefer aftermarket artisan straps because they offer superior build quality, wider material selection, and customisation options. Milano Straps produces 22mm straps in leather, NATO, and rubber specifically designed for chronographs like your 861870, with construction details (buckle thickness, grain texture) that respect the visual weight of the case.

A quality leather strap—vegetable-tanned calf or alligator—lasts 3 to 7 years under daily use, depending on environmental conditions and maintenance. Leather is a living material: humidity, sweat, and sunlight exposure accelerate ageing. To extend longevity, avoid prolonged immersions (the 861870 is water-resistant to 10 bar, but the strap is not), dry promptly if wet, and occasionally apply leather balm. The patina that develops is not deterioration but acquired character.