Longines
Conquest L3.720.4.52.9— lug 19mm

The lug width of the Longines Conquest L3.720.4.52.9 is 19 millimetres. This measurement is specific to this model and requires dedicated straps, as standard aftermarket options rarely reach this dimension. To verify the measurement, use a digital calliper, measuring the interior distance between the two lugs on the case.

The optimal strap depends on intended use. For formal elegance, we recommend black alligator or shell cordovan with vegetable tanning; for daily versatility, pearl grey or black calf leather in vegetable tanning; for sporting activities, NATO straps or natural vulcanised rubber. Vegetable-tanned leather guarantees durability exceeding 15 years of continuous wear.

To change the strap, use a spring bar tool (specialised tool with bifid tip). Insert the tip into the spring bar holes, apply gentle upward pressure to release the bar from its seat, then remove the previous strap. Insert the new strap by aligning the holes with the lugs and press the spring bar until it clicks into place. Verify the bar is fully seated.

Yes, the Longines Conquest L3.720.4.52.9 is fully compatible with high-quality 19mm aftermarket straps. Specialist retailers such as Milano Straps offer personalised straps in leather, alligator, shell cordovan and rubber, all calibrated for this specific lug width.

A high-quality natural leather strap, subjected to vegetable tanning, has an estimated lifespan of 15-20 years with daily wear. Longevity depends on frequency of use, exposure to moisture and ambient relative humidity. Regular maintenance (gentle cleaning and annual conditioning with specialised balms) extends strap life.