Longines
Conquest L3.376.4.97.6— lug 15mm

The lug width of the Longines Conquest L3.376.4.97.6 is 15mm. This measurement represents the internal distance between the two lateral lugs on the case and is the critical parameter for selecting a compatible strap. Measure with precision using a digital calliper or ruler: position perpendicularly to the case, excluding the metal thickness itself. A 15mm strap ensures correct fitment without rotational looseness or forcing that could damage case and leather finishes.

Alligator represents the most harmonious choice: the fine grain of crocodile leather dialogues perfectly with the Conquest's aesthetic sobriety. For daily wear and greater softness, vegetable-tanned calf offers natural patina that evolves over time, developing honey and hazelnut tones. Shell cordovan, if available in 15mm, represents absolute excellence owing to its unequalled polished patina, though it requires conscientious maintenance. For sports versatility, a natural silk NATO allows rapid, aesthetically coherent seasonal changes.

Strap replacement is a straightforward operation requiring no watchmaking intervention. Procure a spring bar remover (inexpensive tool available online), position it beneath the metal lug that connects the strap to the case, apply gentle pressure to retract the internal spring until the strap releases. Once removed, insert the new strap by aligning the lug with the case lugs, pushing gently until you hear a click. Repeat on the opposite side. Avoid hammers and screwdrivers that would compromise case finishes.

Absolutely. The aftermarket strap industry has evolved significantly in recent years, offering straps that rival official Longines proposals. Specialists in 15mm sizing provide Italian alligator, vegetable-tanned calf, and shell cordovan with construction quality and finishes comparable to historic brands. Bespoke workmanship allows customisation of length (for slender or generous wrists), leather selection, decorative stitching, and thread choice. Multi-year warranties (18–24 months) distinguish professional suppliers from improvised ones.

Longevity depends on leather type, frequency of wear, and maintenance. Quality alligator, worn regularly (5–6 days weekly), lasts 4–6 years before requiring intervention. Vegetable-tanned calf, if not exposed to excessive perspiration and humidity, maintains structural integrity for 3–5 years. Shell cordovan, though more robust, is sensitive to prolonged moisture and requires seasonal rest periods. Recommended practice: own at least two 15mm straps (everyday brown alligator, formal black alligator), rotating them monthly to allow leather to breathe and dry completely, extending the useful life of each strap by 12–18 months.