Ulysse Nardin
Marine 1183-310-3A/0A— lug 21mm

The correct lug width is 21mm. This specific measurement reflects the design proportions of the reference and should be measured between the outer edges of both attachment pins. An incorrect strap width would create aesthetic discontinuity and safety concerns regarding accidental detachment.

A quality alligator strap with satin finishing imparts authority without excess, whilst vegetable-tanned calf offers versatility with a noble patina. For sporty approaches, NATO straps in technical canvas or rubber ensure weather resistance. Your choice depends on predominant use and desired personal tone.

Use a dedicated spring bar removal tool to extract the pins fastening the strap to the case lugs. Position the watch on a stable, well-lit surface and work with deliberate gentleness to avoid scratching the steel. Ensure the new strap clicks fully into place. If lacking expertise, consult a certified professional.

Absolutely. Artisanal 21mm straps meet the technical specifications of the reference without compromise. The critical factor is selecting suppliers guaranteeing compatible pins, coherent finishing, and durable materials. An aftermarket strap does not affect warranty if the swap is executed correctly.

Longevity depends on tanning quality and usage patterns. A premium alligator or vegetable-tanned calf, worn daily, develops significant patina within 2–3 years and remains wearable for 5–7 years before replacement. Prolonged direct sunlight exposure, stagnant humidity, and perspiration accelerate deterioration. Regular maintenance—cleaning and drying—substantially extends lifespan.