Strap for Conquest Automatic 39 Ceramic

The lug width of the Longines Conquest L3.655.4.56.0 is precisely 19 millimetres. This measurement is critical for strap compatibility: 18 or 20 millimetre straps will not fit correctly into the watch lugs. To verify, use a digital calliper or millimetre ruler to measure the distance between the two spring bar attachment pins on the case. MilanoStraps stocks the complete range of 19mm straps compatible with this Longines model.

The best strap depends on your use case and aesthetic preference. For a classic, authoritative look, we recommend natural dark brown alligator or vegetable-tanned calf in natural tone: these materials dialogue with the grey ceramic case without competing visually. For daily wear and humid environments, a heavyweight cotton NATO or vulcanised rubber strap guarantees maximum practicality and longevity. Atelier Casati Milano, available by appointment, allows you to handle materials and identify the solution best suited to your wrist and usage patterns.

Strap replacement requires specific tools: a spring bar removal tool and care when handling the case. On the 39mm Conquest, the lugs are robust but sensitive to damage. Procedure: position the spring bar tool in the slot on the lug, push downward gently to release the spring, remove the old bar, insert the new strap, and reposition the bar aligned with the case attachment holes. If you lack confidence in this operation, we recommend professional strap replacement via MilanoStraps or Casati Milano, where the change is completed under visual inspection in 10–15 minutes.

Yes, absolutely. The Conquest L3.655.4.56.0, like all watches with standard 19mm lugs, is completely compatible with quality aftermarket artisan straps. The advantage is freedom of choice: specific leathers, custom finishes, bespoke deployante. MilanoStraps supplies 19mm straps crafted in Italian, Spanish and French leather, with the option to customise wrist length, initials and thread colour. I guarantee that each strap is constructed for longevity, with consistent thickness and correct construction tolerances.

Leather strap lifespan varies based on material and usage. A natural alligator with vegetable tanning, worn in rotation with other watches, lasts 7–10 years. Vegetable-tanned calf lasts 5–8 years with daily wear; if alternated with other straps, life extends beyond 10 years. Primary wear occurs at stress points (lugs and buckle zone) where leather undergoes mechanical stress. MilanoStraps includes an 18-month warranty on all artisan straps, covering manufacturing defects and premature fractures. To extend useful life: avoid prolonged direct water exposure, apply protective treatment every 12–18 months, and store the strap in a dry environment when not in use.