Strap for Flagship 35.6 Quartz

The lug width of the Longines Flagship L4.716.4.52.6 is 20mm. This measurement is taken between the two tubular pins that support the strap on the case. It is now a rare standard in the contemporary market and characteristic of dress-class watches from the 1950s and 1960s. Before purchasing an aftermarket strap, always verify the lug width to ensure precise fitting.

Alligator is the most noble choice for this model: its natural grain creates a visual effect of formal lightness and the patina that develops over time enriches the watch. Shell cordovan is a sophisticated alternative for those seeking pronounced texture and superior resistance. Vegetable-tanned calf represents a balanced compromise between aesthetics, durability and sustainability. The use of rubber or NATO straps is discouraged, as they alter the dress aesthetic code of the collection.

To change the strap, obtain a dedicated spring bar removal tool. Position the watch on a soft, flat surface. Insert the tool into the narrow opening between the case and strap, then gently lift the pin until it releases and retracts. Repeat on the other side. Remove the old strap and insert the new one, ensuring that the pins lock correctly in both lugs. If unsure, consult a professional to avoid damage to the tubular pins.

Yes, quality aftermarket straps are available for the 20mm lug width. It is essential to verify that the new strap has the same lug width and that the pins are compatible with standard diameter specifications. Online you will find a selection of 20mm straps customisable in size, colour and stitching details. For a complete artisanal experience, you can contact a specialist atelier such as Casati Milano for a custom-made strap with personal selection of leather.

The durability of a leather strap depends on the material and usage. Alligator and shell cordovan, with proper maintenance, last 5-8 years before needing replacement. Vegetable-tanned calf has a similar lifespan, 4-7 years, due to its natural resistance. Longevity increases if the strap is not continuously exposed to moisture, heat and perspiration. Good practice is to rotate straps periodically and store them in dry environments. An 18-month warranty covers manufacturing defects, but not the natural wear of leather over time.