Strap for Flagship 35.6 Automatic Stainless Steel Black

The lug width of the Longines Flagship L4.774.4.52.2 is 18mm. This measurement is specific to this model and requires a strap manufactured with appropriately sized lugs. Precise measurement is achieved by placing a digital calliper between the two lug attachment points on the case, excluding protruding bezel material.

For the Longines Flagship L4.774.4.52.2, straps in vegetable-tanned alligator (dark brown or cognac), structured calf leather, or shell cordovan are recommended for those seeking maximum aesthetic rigour. Choice depends on occasion: formal for alligator and shell cordovan, versatile for calf leather, sporty for NATO straps in neutral tones.

Changing the strap on the Flagship L4.774.4.52.2 requires a dedicated spring bar tool to compress the internal tension springs within the lugs. Position the tool in the appropriate slot, gently push to extract the spring, then decouple the strap. To mount the new strap, repeat the operation in reverse, ensuring the lugs fit perfectly into the case slots.

Yes, aftermarket straps compatible with this model can be used, provided they are manufactured with 18mm lugs. It is important to verify that the lugs fit correctly into the case slot, as variations of even 0.1mm can generate visual imperfections or micro-scratches. Artisanal Milanese straps are custom-made to guarantee this precision.

The lifespan of a leather strap depends on usage and maintenance. Under normal conditions, a high-quality artisanal alligator or calf strap lasts 3–5 years. Shell cordovan, due to its denser structure, can last 7–8 years. Frequency of wear, humidity exposure, and regular cleaning significantly affect longevity. An 18-month warranty is standard for custom-made straps.