Strap for Flagship 40 Stainless Steel - Yellow Gold / White - Roman / Bracelet

The Longines Flagship L4.984.3.21.7 features a lug width of 21 mm. This is the precise space between the case lugs where the strap must fit. Verifying this measurement before purchasing a strap is essential to guarantee complete compatibility with your timepiece.

Genuine alligator is the traditional and most appropriate choice: its natural grain structure imparts refined elegance and develops a distinctive patina over time. Vegetable-tanned calf leather offers a versatile alternative with immediate softness, ideal for those preferring instant comfort. Shell cordovan excels in longevity, though it requires a longer break-in period.

Use a dedicated spring bar tool to carefully remove the elastic pins securing the strap to the case. Thread the new strap through the lugs, ensuring its passages wrap around the lugs properly, then reinsert the pins. Verify that the strap is firmly secured before wearing the watch. If inexperienced, consult a professional watchmaker.

Compatibility is guaranteed by the 21 mm lug width, which is the standard for this Longines reference. However, it is advisable to confirm that the strap was specifically engineered for classic 40 mm steel watches, ensuring overall aesthetic harmony and longevity.

An artisanal alligator or vegetable-tanned calf leather strap typically lasts 3-5 years with regular daily use, provided it receives proper care: avoid prolonged water exposure, protect it from direct heat sources and condition it occasionally with natural oils. Lifespan varies depending on intensity of use and climate. Natural leather ageing is a positive aesthetic aspect over time.