Strap for Conquest 41 Automatic GMT

The lug width of the Longines Conquest L3.687.4.56.6 is precisely 20mm. This measurement represents the historical standard for wristwatches in this dimensional category (41mm case), ensuring a balanced visual ratio between case mass and strap thickness. A 20mm lug width requires careful selection of compatible straps.

For the Conquest, we recommend three options based on use case: brushed alligator niloticus in tortoise grey for technical and formal environments; vegetable-tanned calf leather in brown tones for daily versatility and patina development; tactical nylon NATO in high-density polyamide for nautical and pure outdoor use. The brushed stainless steel case pairs ideally with materials that do not compete in lustre, favouring regular textures and matte finishes.

Straps with 20mm lug width are replaced by removing the pins (spring bars) connecting the strap to the case lugs. Use a spring bar tool to apply gentle downward leverage—do not twist. Extract the old pin, align the new strap with the case apertures, and reinsert the pin until it clicks into place. Verify that both ends are securely fastened before wearing the watch.

Yes, any strap with a 20mm lug width is compatible with the Conquest L3.687.4.56.6. The case lugs accept standard 1.5mm diameter pins. It is essential to verify that the total strap length (pin to pin) falls within ±2mm tolerance of the original dimensions to ensure correct fit and optimal wrist comfort.

A quality leather strap (alligator, calf, cordovan) worn daily on the 20mm lug width has an average lifespan of 3–5 years. Wear concentrates at the flexion zones (around pins) and at the buckle/deployant. Durability increases significantly if the strap is not exposed to constant moisture and undergoes periodic maintenance (cleaning, conditioning with natural wax). NATO straps have superior durability (7–10 years) due to double-layer construction.