Strap for Flagship 26 Automatic Two Tone Black Diamond

The lug width (misura ansa) of the Longines Flagship L4.274.3.57.7 is 13mm. This non-standard measurement requires a specific search for compatible straps. To verify personally, place a digital calliper between the two lug horns where the strap attaches: you will find exactly 13mm. Milano Straps offers a complete selection of 13mm straps suited to this model.

The ideal strap depends on your usage context and aesthetic preferences. For a formal and durable approach, vegetable-tanned alligator represents the most refined choice, offering a decade-long lifespan and a patina that dialogues perfectly with the case steel. Vegetable-tanned calf leather provides chromatic versatility and softness, ideal for those who change straps seasonally. For dynamic use, shell cordovan guarantees exceptional durability and a unique caramelised patina. Contact the Casati Milano atelier for personalised advice on available leathers.

Strap replacement on the Longines Flagship L4.274.3.57.7 is performed through spring bars located at the lug ends. Use a dedicated tool (spring bar tool) to slightly compress the pin, thus freeing the old strap. Insert the new strap (13mm) by re-engaging the spring bar into position. If you are not experienced, Milano Straps and the Casati Milano atelier offer replacement services with a guarantee on workmanship. For a stress-free experience, entrust the operation to skilled hands.

Any strap with a lug width of 13mm is compatible with the Longines Flagship L4.274.3.57.7. Milano Straps offers an exclusive collection of 13mm straps in natural leather (alligator, calf, shell cordovan) in vegetable tanning, as well as options in fabric and vulcanised rubber. Each strap can be personalised in length, initials and stitching thread colour. Browse the online catalogue or contact the Casati Milano atelier for a bespoke selection made to measure.

The lifespan of a leather strap depends on the material and usage. Vegetable-tanned alligator, if properly maintained, guarantees a lifespan of 8–12 years even with daily wear. Vegetable-tanned calf, being more delicate, typically lasts 5–7 years. Shell cordovan, thanks to the extreme density of the fibre, can exceed 15 years. Milano Straps' artisanal straps are made from first-grade leathers and benefit from an 18-month warranty. Mindful maintenance (avoiding prolonged moisture, air-drying, applying natural balm seasonally) significantly extends useful life.