Strap for Master Collection Big Date

The Longines Master Collection L2.648.4.78.6 features a lug width of 20 millimetres, measured between the outer terminals of the case lugs. This width is proportionate to the 40-millimetre case diameter and is the essential specification for selecting compatible straps.

Given the formal and restrained character of the Longines Master Collection L2.648.4.78.6, the most recommended materials include: alligator in dark brown or black for formal wear, Japanese shell cordovan for exceptional longevity and patina development, vegetable-tanned calf for organic character, or high-quality vulcanised rubber for versatile daily wear. Choice depends on intended use and personal aesthetic preference.

To change the strap, use a spring bar removal tool. Insert the tip into the small aperture on the inner side of the lug, gently compress the internal spring until the pin releases, then repeat for both terminals. This operation requires precision to avoid damaging the case. If inexperienced, professional assistance is recommended.

Yes, any strap or bracelet with a 20-millimetre lug width is compatible with the Longines Master Collection L2.648.4.78.6. Always verify the width specification before purchase. Artisanal leather straps, NATO fabric, rubber, or metal bracelets are all viable options provided they meet the 20mm requirement.

Leather strap longevity varies with material and usage intensity. Quality alligator typically lasts 3–5 years with regular wear; Japanese shell cordovan can exceed 7–10 years; vegetable-tanned calf lasts 2–4 years. Frequency of use, humidity exposure, and perspiration absorption all affect durability. Regular maintenance, particularly drying after use in damp conditions, significantly extends strap lifespan.