Longines
Conquest L3.720.4.02.9— lug 19mm
Longines Conquest L3.720.4.02.9: 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 L3.720.4.02.9The essential strap measurement.
Browse 19mm straps →L3.720.4.02.9
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 L3.720.4.02.9?
The Longines Conquest L3.720.4.02.9 features a fixed lug width of 19 millimetres. This specification is rigid and model-specific. To verify strap compatibility, measure the space between the lugs using a calliper: it must be exactly 19mm to ensure a precise fit without play or visible gaps.
What is the best strap for the Longines Conquest L3.720.4.02.9?
The ideal strap depends on your intended use. For authentic elegance, we recommend alligator in black or cognac brown with saddle stitching. For versatility and natural ageing, vegetable-tanned calf leather is excellent. For sporty wear, a satin rubber strap or suede calf offers comfort and durability. All straps must feature 19mm lug width and, preferably, a deployant clasp in stainless steel.
How do I change the strap on a Longines Conquest L3.720.4.02.9?
The Conquest strap is secured via spring bars. Proceed as follows: use a dedicated spring bar tool or a fine needle to compress the internal spring, then extract the bar from one end of the lug. Once free, the strap detaches easily. To install a new strap, insert the bar through the new strap's lug hole and, using the same tool, position the bar's end in the opposite lug seat until it clicks into place. Verify that the strap is secure before wearing the watch.
Can I use an aftermarket strap on a Longines Conquest L3.720.4.02.9?
Yes, quality aftermarket straps are fully compatible with the Conquest as long as they respect the 19mm lug width specification. At milanostraps.it you will find artisanal straps crafted for this specific size in noble materials such as alligator, vegetable-tanned calf, and shell cordovan. The Casati Milano atelier also offers bespoke custom creations with personalised leather selection and choice of stitching thread.
How long does a leather strap last on a Longines Conquest L3.720.4.02.9?
The lifespan of a leather strap depends on the material, frequency of use and climate conditions. Vegetable-tanned calf, with regular maintenance (cleaning and conditioning treatment), can last 3–5 years. Alligator is more durable and can exceed 5–7 years. Avoid prolonged exposure to fresh water and excessive humidity. Straps crafted by Casati Milano benefit from an 18-month warranty against manufacturing defects and premature wear.