Strap for Master Collection 40 Date Stainless Steel / Silver-Arabic / Bracelet

The lug width of the Longines Master Collection L2.793.4.78.6 is precisely 21 millimetres. This is the internal distance between the two lateral attachment holes on the case. This measurement must be strictly observed to ensure compatibility and correct strap operation without excessive play or structural stress.

For the Master Collection, we recommend cognac brown or jet black alligator leather, which emphasises the understated elegance of the case and the proportional balance of the dial. For those preferring an evolving patina, vegetable-tanned leather in honey or tobacco tones offers character and natural refinement over time. Calf leather in navy blue or burgundy provides chromatic versatility without compromising the model's formal identity.

Strap replacement requires removal of the lug pins using specialist watchmaking tools: a watchmaker's hammer and a spring bar tool. Position the spring bar tool beneath the internal pin and tap gently with the hammer until the pin slides outward; repeat on the opposite side. Entrust the operation to a professional if you lack the appropriate tools to avoid scratching the case.

Yes, any strap with a 21mm lug width is mechanically compatible. High-quality artisanal aftermarket straps, crafted from alligator, calf or vegetable-tanned leather, fit perfectly onto the case lugs. The construction quality and finish of the strap determine aesthetic harmony with the case.

A quality leather strap—alligator, calf or vegetable-tanned—maintains structural integrity for 5–7 years with daily wear and ordinary maintenance. Longevity depends on ambient humidity, cleaning frequency and tanning quality. Vegetable-tanned leather tends to dry more quickly, whilst alligator resists time better, developing a noble patina.