Longines · Flagship

Strap for Flagship 40 Stainless Steel / White / Bracelet

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter40 mm
ReferenceL4.984.4.12.6
FamilyFlagship
MovementLongines caliber L888.5 Hours, Minutes, Seconds | Date | Chronometer
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Flagship L4.984.4.12.6

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Flagship L4.984.4.12.6, seen from the bench

The Longines Flagship reference L4.984.4.12.6 is powered by the automatic Caliber L888.5 with chronometer certification. The movement indicates hours, minutes, central seconds, and date. The case features 21mm lugs for the strap.

Frequently asked questions

What is the lug width of the Longines Flagship L4.984.4.12.6?

The lug width is 21 mm. This measurement refers to the distance between the spring bar pins that secure the strap to the case. It is essential to respect this dimension precisely to ensure compatibility and a secure fit.

What is the best strap for the Longines Flagship L4.984.4.12.6?

There is no universal choice; it depends on intended use. For formal contexts, we recommend alligator or calf leather with vegetable tanning. For summer, shell cordovan offers natural lustre and superior moisture resistance. For daily sports wear, a rubber or NATO strap provides practicality and quick changes without tools.

How do I change the strap on my Longines Flagship L4.984.4.12.6?

The strap is removable via the spring bar pins. Use a dedicated tool (spring bar tool) to extract the pins from their seats in the case. Position the new strap and reinsert the pins. A deployante buckle with micro-adjustment further simplifies the operation, enabling precise fit without removing the strap.

Can I use third-party straps compatible with my Longines Flagship L4.984.4.12.6?

Yes. The 21 mm lug width is a standard used by many brands, so numerous artisanal options are available online. Ensure the strap has been manufactured for this specific measurement and that the spring bar seat is appropriate. MilanoStraps offers a dedicated selection of 21mm straps with customisation options.

How long does a leather strap last on the Longines Flagship L4.984.4.12.6?

Durability varies based on material, usage, and climate. A quality alligator or calf leather with vegetable tanning, if subjected to routine maintenance (regular cleaning, nourishing cream application every six months), maintains structural integrity for 5-8 years. Ageing is part of the appeal: the patina that develops increases aesthetic value over time. MilanoStraps guarantees its straps for 18 months.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only