Strap for Conquest Automatic 41mm Blue Leather

The lug width (misura ansa) of the Longines Conquest L3.658.4.96.0 is 21mm. This measurement refers to the free space between the two lug poles where the strap sits. It is model-specific, so your replacement strap must be compatible with this 21mm dimension to ensure proper fitting and alignment with the case.

There is no universal best choice, but alligator leather represents the collector's option thanks to its regular grain and patina that ages beautifully. Vegetable-tanned calf offers a softer alternative with rapid ageing characteristics. For a purely sportive approach, a NATO strap in cotton or nylon remains the most versatile choice. Cold-vulcanised rubber is ideal for intensive daily use due to its water resistance and comfort properties.

Strap replacement requires a dedicated spring bar removal tool. Position your watch on a stable surface, locate the tension springs inside the lugs, insert the tool into the slot to release the spring, gently extract it, and remove the old strap. Insert the new strap aligned with the lugs, then reposition the tension spring until it clicks into place. If you are uncertain about the procedure, entrust the operation to a specialised atelier such as Casati Milano.

Yes, provided the strap is compatible with the 21mm lug width. Quality aftermarket straps maintain the same seating standards and tolerances as original straps. We recommend verifying technical specifications before purchase, and if possible, choosing specialist brands that guarantee precise compatibility. A custom-made strap from an atelier like Casati Milano ensures perfect fit and complete quality control.

Durability depends on material and usage. A well-maintained alligator strap, with periodic treatments and water protection, can last 3-5 years. Vegetable-tanned calf typically lasts 2-3 years due to the natural ageing process and lower moisture resistance. Cotton NATO straps offer superior durability, 5+ years. To extend the lifespan of any leather strap, avoid prolonged exposure to fresh water, apply protective creams every 6-12 months, and store the watch in dry environments when not in use.