Strap for Conquest Chronograph Quartz

The lug width of the Longines Conquest L3.660.4.56.3 is precisely 21mm. This measurement represents a specific constructive characteristic of the model and corresponds to the distance between the two spring bar pins that anchor the strap to the case. A 21mm strap must fit the lugs with millimetre precision, without lateral play.

The Longines Conquest L3.660.4.56.3 pairs perfectly with alligator, vegetable-tanned calf leather, shell cordovan, and NATO fabrics. Alligator offers formal elegance through its naturally fine grain. Aged calf leather adds visible patina over time. Shell cordovan provides structural rigidity for those seeking a more tactile aesthetic. NATO remains the pragmatic choice for sporting or saltwater environments.

Strap replacement requires a dedicated spring bar removal tool. Position the watch on a stable stand, locate the small holes at the ends of each spring bar pin, insert the tool to release tension, and gently extract the spring bar and old strap. Align the new 21mm strap with the lugs and reinsert the spring bar with even pressure until it clicks into position.

Yes, quality aftermarket 21mm straps compatible with this model exist. Milano Straps offers a dedicated collection of 21mm straps in noble materials such as alligator, calf leather, and shell cordovan, with customisation in length, initials, and stitching thread. The Casati Milano atelier creates bespoke custom straps with an 18-month warranty.

The lifespan of a leather strap depends on frequency of use, material type, and maintenance care. A quality alligator or calf leather, worn daily, maintains structural integrity for 3-5 years. Shell cordovan, given its density, can extend this duration to 6-7 years. Ageing does not mean deterioration but aesthetic development: leather acquires patina and character. Protecting the strap from excessive moisture and direct heat sources significantly prolongs its life.