Strap for Flagship 26 Automatic Two Tone Champagne Diamond

The lug width of the Longines Flagship L4.274.3.37.7 is 13 millimetres. This is a specific dimension for this generation of the Flagship, narrower than modern standards of 16-18mm. To verify the measurement correctly, use a digital calliper and measure the width of the outer pin at the widest point between the two lugs of the case.

For the Flagship L4.274.3.37.7, it is advisable to choose between alligator (Mississippi or Nile) with traditional tanning for aesthetic coherence, vegetable-tanned calf for durability and natural patina development, or shell cordovan for those accepting initial stiffness. Cognac or black alligator remains the most coherent choice with the watch's design philosophy, developing natural colour maturation over time.

The strap is changed by removing the spring bars located between the case and the strap. Use a dedicated tool (spring bar tool) to compress the pin and insert it into the lug slots of the new strap. Ensure the bar is fully engaged on both sides before wearing the watch. If you are not experienced, consult a watchmaker or Casati Milano's service.

Yes, you can fit 13mm aftermarket straps on your Flagship. However, as the 13mm size is not standard among modern straps, sourcing from specialist suppliers is advisable. Milano Straps offers a dedicated collection of 13mm straps, customisable in materials and Italian craftsmanship.

The lifespan of a leather strap depends on the material and use. Vegetable-tanned alligator typically lasts 4-6 years of daily wear before replacement. Shell cordovan, thanks to material density, can last 6-10 years. Vegetable-tanned calf sits between 3-5 years. Regular exposure to moisture, direct sunlight or extreme temperatures significantly reduces longevity. Straps made by Casati Milano include an 18-month warranty against manufacturing defects.