Strap for Master Collection Date 38.5 Two Tone Diamond

The lug width is exactly 20 mm. This measurement is specific to the L2.628.5.77.7 model with its 38.50 mm case and is determined by the construction proportions of the case and its lugs. It is essential to verify that the strap has precisely 20 mm width at the attachment point to ensure secure installation and correct visual geometry.

Alligator remains the most refined choice due to its natural texture and its ability to dialogue elegantly with the two-tone yellow gold and stainless steel case. Alternatively, Italian calf leather worked with vegetable tanning develops a rich patina over time. For more sporty wear, a high-quality FKM rubber strap offers practicality without stylistic compromise.

The strap is removed using a specialised tool called a spring bar remover, which allows you to compress the curved springs (spring bars) in the lateral lugs of the case. Once the spring is lifted, the strap slides out laterally. For installation, the procedure is reversed: the new strap must be aligned, the spring inserted gently, and verified to be completely locked. This operation is best carried out by a professional to avoid scratching the case.

Yes, provided the strap has an effective lug width of 20 mm and a thickness not exceeding 1.5 mm at the attachment point. High-quality aftermarket straps (such as those from Milano Straps) are fully compatible and often offer greater colour and construction variety compared to official Longines options.

A high-quality artisanal leather strap (alligator or vegetable-tanned calf) typically lasts 3-5 years with daily wear, provided it is subjected to regular maintenance: avoid direct water exposure, dry it after accidental water contact, and occasionally apply a specific balm. Wear is concentrated around the buckle and lug area. Many owners change their strap every 2-3 years for aesthetic reasons, as the leather develops a patina that some appreciate and others prefer to replace.