Strap for Flagship 35.6 Day Date Stainless Steel

The Longines Flagship L4.799.4.57.6 features lugs of 18 mm, a rare and specialised measurement corresponding to the distance between the two lug attachment pins on the case. This measurement is certified and fixed for this model, and represents a distinctive characteristic of vintage and classic Longines timepieces.

The ideal strap is alligator in warm mahogany brown or midnight black, which enhances the formal elegance of the 35.60 mm case. Alternatively, vegetable-tanned calf leather in antique burgundy offers authenticity and a patina that evolves over time. For sports use, a grey or navy blue NATO fabric maintains aesthetic balance.

18 mm straps are changed using a spring bar removal tool. Position the watch on a stable support, gently lever each pin from the inside of the case, remove the old strap and insert the new one by sliding the bars into their sockets. A simple operation requiring care to avoid scratching the case.

Yes, you can use compatible aftermarket straps with 18 mm lugs, provided they are certified and made from superior materials such as alligator, Italian calf leather or shell cordovan. It is essential to verify the exact lug width before purchase; milanostraps.it offers 18 mm straps compatible with customisation.

A superior quality leather strap (alligator or vegetable-tanned calf) has an average lifespan of 4-6 years with moderate daily use. Longevity depends on usage, sun exposure and humidity. Vegetable tanning evolves aesthetically over time, developing a prized patina. The Casati Milano atelier offers straps with an 18-month warranty.