Longines
Conquest L3.720.4.02.6— lug 19mm
Longines Conquest L3.720.4.02.6: 19mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 19mm lug width to preserve the original sartorial balance."
Technical Specifications
Longines L3.720.4.02.6The essential strap measurement.
Browse 19mm straps →L3.720.4.02.6
Longines caliber L888.5 Hours, Minutes, Seconds | Date | Chronometer
The Heritage
Compatible Straps
Selected for the 19mm lug width of the Conquest
FAQ
What is the lug width of the Longines Conquest L3.720.4.02.6?
The lug width of the Longines Conquest L3.720.4.02.6 is 19 millimetres. This measurement is essential for selecting the correct strap: the strap must be 19 millimetres wide to fit perfectly into the case lugs without play or lateral protrusion. To verify the measurement, remove the original strap and measure the distance between the metal rings protruding from the case.
What is the best strap for the Longines Conquest L3.720.4.02.6?
The best strap depends on use and personal preference. For formal elegance, we recommend cognac brown alligator or shell cordovan, which enhance the brushed steel case. For daily versatility, vegetable-tanned calf leather offers immediate comfort and natural ageing. For sporting contexts, a Cordura NATO or structured rubber maintains the watch's original functionality. All straps must have a 19-millimetre lug width.
How do you change the strap on a Longines Conquest L3.720.4.02.6?
Strap replacement is performed by removing the spring bars (also called lugs) that connect the strap to the case. Using a dedicated tool (spring bar tool) or a thin instrument, push the bar downward to free one end of the strap, then extract it completely. Repeat for the second bar. Insert the bars into the new strap, ensuring perfect alignment with the holes and ensuring they are parallel and fully inserted. The process requires care to avoid scratching the steel.
Is an aftermarket strap compatible with the Longines Conquest L3.720.4.02.6?
Yes, any strap with a 19-millimetre lug width is compatible with the L3.720.4.02.6, regardless of brand. Compatibility is determined by lug width, not by the watch manufacturer. We recommend quality straps with authentic leather finishes (alligator, calf, shell cordovan) or certified technical fabrics (NATO, Cordura). Always verify that the strap's total length is appropriate for your wrist, as measurements vary between manufacturers.
How long does a leather strap last on a Longines Conquest L3.720.4.02.6?
Durability depends on material and use. A quality alligator or calf strap with vegetable tanning lasts an average of 3–5 years with daily wear, ageing elegantly and developing a characteristic patina. Shell cordovan is more resistant, lasting 5–7 years due to the leather's density. Natural rubber remains functional for 2–3 years without significant aesthetic deterioration. A low-quality leather strap degrades within 12–18 months. To extend lifespan, avoid prolonged moisture exposure, apply leather balm every 6 months, and store in a cool, dry place.